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The term shock collar is a term used in order to describe a family of training collars (also called e-collars, Ecollars, remote training collars, Zap collars, or electronic collars) that deliver electrical shocks of varying intensity and duration to the neck of a dog (they can also be applied to other places on the dog's body) via a radio controlled electronic device incorporated into a dog collar. Some collar models also include a tone or vibrational setting, as an alternative to or in conjunction with the shock. Others include integration with Internet mapping capabilities and GPS to locate the dog or alert an owner of its whereabouts.
Originally used in the late 1960s to train hunting dogs, early collars were very high powered. Many modern versions are capable of delivering very low levels of shock. Shock collars are now readily available and have been used in a range of applications, including behavioral modification, obedience training, and pet containment, as well as military, police and service training. While similar systems are available for other animals, the most common are the collars designed for domestic dogs.
The use of shock collars is controversial and scientific evidence for their safety and efficacy is mixed. A few countries have enacted bans or controls on their use. Some animal welfare organizations warn against their use or actively support a ban on their use or sale. Some want restrictions placed on their sale. Some professional dog trainers and their organizations oppose their use and some support them. Support for their use or calls for bans from the general public is mixed.
Types of devices 
Pet containment systems 
The most common use of shock collars is pet containment systems that are used to keep a dog inside the perimeter of the residence without the construction of a physical barrier. This use of shock collars is increasingly popular in areas where local laws or homeowners' associations prohibit the construction of a physical fence. Available systems include: in-ground installation to preserve the aesthetics of the yard; above ground installation to reinforce an existing barrier that was not sufficient in containing the dog; and wireless systems to allow for indoor use. Most pet containment systems work by installing a wire around the perimeter of the yard. The wire carries no current (as opposed to electric fences which do carry a current at high voltage that may be lethal in the event of unauthorized or defective installation or equipment) but forms a closed loop with a circuit box that transmits a radio signal to the receiver collar worn by the dog (Lindsay 2005, p. 573). As the dog approaches the perimeter the collar will activate. A "scat mat", is a battery operated or plug in pad that delivers a shock if the animal walks on it. These pads are used on furniture, windowsills, counters or in hallways to prevent an animal from touching or accessing an area. The animal learns to avoid receiving a shock by avoiding contact with the mat.
Bark control collars 
Bark control collars are used to curb excessive or nuisance barking by delivering a shock at the moment the dog begins barking. Bark collars can be activated by microphone or vibration, and some of the most advanced collars use both sound and vibration to eliminate the possibility of extraneous noises activating a response.
Training collars or remote trainers 
Training collars can be activated by a handheld device. Better quality remote trainers have a large variety of levels and functions, can give varying duration of stimulation, better quality stimulation, and have a beep or vibration option useful for getting the dog’s attention. Proper training is an imperative for remote collar use, as misuse can cause negative behavioral fallout (Polsky 2000). Many recommend consulting a behaviorist or a training professional who is experienced with shock collars for successful usage and application. But there are DVDs available and websites that give "step-by-step" instructions for proper use that can also be followed.
Shock collars may be used in conjunction with positive reinforcement and / or utilizing other principles of operant conditioning, depending on the trainer's methods either as a form of positive punishment, where the shock is applied at the moment an undesired behavior occurs, in order to reduce the frequency of that behavior; or as a form of negative reinforcement, where a continuous stimulation is applied until the moment a desired behavior occurs, in order to increase the frequency of that behavior.
Some trainers use a low level of shock as a marker and pair it with a reward, making the collar a conditioned reinforcer, similar to clicker training. Some shock collars include vibration or tone-only settings, which can be used as a "neutral stimulus" for most dogs. A special application exists for the positive reinforcement and marker training of deaf dogs. This happens when the training is to "pair the mild shock produced by the collar with food and other rewards. As a consequence, the shock can then be used to reinforce desirable behaviors conditionally in much the same manner as applying other common conditioned reinforcers (e.g. "Good")." 
Frame of reference 
"At low levels, the term shock is hardly fitting to describe the effects produced by electronic training collars, since there is virtually no effect beyond a pulsing tingling or tickling sensation on the surface of the skin ... the word shock is loaded with biased connotations, images of convulsive spasms and burns, and implications associated with extreme physical pain, emotional trauma, physiological collapse, and laboratory abuses ... the stimulus or signal generated by most modern devices is highly controlled and presented to produce a specific set of behavioral and motivational responses to it." 
Some trainers who use shock collars will compare the sensation they deliver to the "static shock" that people sometimes get when reaching for a door knob or car door. This is not to imply that shock collars emit static electricity but rather to give the potential user an idea of what a shock collar feels like. It's often startling, sometimes painful, but has never been shown to cause physical injury.
Comparing the effects of shock collars with other electrical stimulation products, Dr. Dieter Klein has stated that, "Modern devices ... are in a range in which normally no organic damage is being inflicted. The electric properties and performances of the modern low current remote stimulation devices ... are comparable to the electric stimulation devices used in human medicine. Organic damage, as a direct impact of the applied current, can be excluded.”  Shock of this nature carries little energy (on the order of millijoules, 1 millijoule = 0.001 joule ). "At 0.914 joules the electric muscle stimulation and contractions a human receives from an 'abdominal energizer' fitness product is exponentially stronger — more than 1,724 times stronger— than the impulse a dog receives from a pet containment collar set at its highest level.".
- A "remote trainer" set on a low level emits 0.000005 joules (5 microjoules).
- A "bark collar" set on a high level emits 0.0003 joules (300 microjoules).
- A "muscle stimulation machine" set on a "normal level" emits 2.0 joules.
- Set on a "high level" it emits 6.0 joules.
- An electric fence energizer [a "charged fence" – not a pet containment system] emits 3.2 joules.
- A modern defibrillator can emit up to 360 joules.
Technical considerations 
Electric shock can be characterised in terms of voltage, current, waveform, frequency (of waveform), pulse rate and duration. Although voltage, current and duration of shock can be used to calculate the amount of energy applied (in Joules), these are not indicators of the intensity of the stimulus or how it may be perceived by the recipient. Static electric shocks that are experienced in daily life are of the order of 10,000 volts, and yet are not painful or physically damaging because they are of very low current. Modern shock collars can be set so that the current they give off is only mildly uncomfortable. No shock collar on the market today is limited to deliver shocks of such low intensity. The lack of such limits is because variable settings are essential, so that the shock collar can be adjusted to the level that the dog requires, and adjusted as situations change. The shock, and the animal's perception of it, can be affected by a number of factors.
Individual variations in temperament, pain sensitivity and susceptibility to startle of dogs, means that shock settings must be carefully adjusted to produce a shock that is perceived by the dog as aversive enough to stop the dog engaging in the unwanted behaviour. The single most important factor is the animal's level of arousal during training. Normally salient stimuli, such as noises, commands and even shocks, may have no effect on a dog that is highly aroused and focused on an activity such as hunting.
In order to deliver consistent shocks, good contact must be made between the collar electrodes and the dog's skin (the collar must be fitted according to the manufacturer's instructions). Local humidity and individual variation in coat density, skin thickness and surface conductivity, will also affect the delivery of the shock.
The waveform, its frequency, the pulse rate, amperage, voltage and impedance are important determinants of likely response. "Many e−collars appear to shift intensity levels by altering the pulse duration or repetition rate while keeping the output current and voltage relatively constant, depending on the electrode−skin load." (Lindsay 2005, p. 573).
Shock collars are sometimes referred to as delivering a "static shock"; however, static electricity is direct current and carries little energy (order of millijoules). Shock collars make use of alternating current. It is therefore inappropriate to refer to shock collars as delivering a static shock.
No regulations exist specifying the performance characteristics or reliability of these devices, so there is considerable variation in shock level and waveform characteristics between manufacturers, and perhaps even between batches of collars from a single manufacturer. The lack of regulation or standards, and the fact that some of the safety features of shock collars are patented by specific manufacturers, means that the safety and operational characteristics of individual products cannot be verified.
Over 31 years ago, in the USA, the Center for Veterinary Medicine (CVM), a branch of the U.S. Food and Drug Administration (FDA), "concurred" in regulatory action against a manufacturer of a bark collar, stating "Complaints received, which were later corroborated by our own testing, included severe burns in the collar area and possible personality adjustment injuries to the dogs. The shocking mechanism was found to be activated not only by barking but by vehicle horns, slamming doors or any other loud noise. CVM concurred in regulatory action against the device since it was deemed to be dangerous to the health of the animal."  However, today's quality bark collars are activated only by the barking of the dog that is wearing the collar and no research study has shown any physical injuries from the current produced by any of these devices.
Scientific studies 
Christiansen et al study (2001a) 
Christiansen et al., looked at behavioural differences between three breeds of dogs when confronted by domestic sheep (138 dogs; Elkhounds, hare hunting dogs and English setters). Two testing procedures were used and shock collars were used to deter attacks on sheep. The first, a path test, involved observing the dogs' reactions to a set of novel stimuli (rag pulled across the track, bundle of cans thrown down, tethered sheep at 5m) as it was walked. The second test involved monitoring the dog's reaction to a free-roaming sheep flock in a field. In this study they identified several factors that predicted a high hunting motivation and attack severity. These were lack of previous opportunity to chase sheep, low fearfulness towards gunshots and unfamiliar people and general interest in sheep when encountering them. Younger dogs (<3 years of age) showed more pronounced initial hunting motivation and more frequent attacks. Elkhounds showed more hunting behaviour, more attacks and were more frequently given electric shocks during the tests. A shock collar was used to deter attacks on the sheep during the experiments. Shocks (3000V, 0.4A, duration 1 second) were delivered when dogs came within a distance of 1-2m of the sheep, and were repeated until the dogs left the area. The objective was to suppress an attack, but not to damage the hunting ability of the dogs. Despite frequently initiated chases and attacks, few shocks were delivered. This was because few dogs approached closer than 1–2 m, and the intention was to deter proximity to sheep rather than to associate hunting behaviour with an aversive shock, which would impair future hunting behaviour in other contexts.
Christiansen et al study (2001b) 
The dogs used in the first study were re-tested using the same procedures in order to assess the long term impact of the training on their reaction to sheep. Again, in the free-running tests the dogs were fitted with a shock collar, which was used to deter approaches to within 1-2m of the sheep. Dogs that had previously been shocked in year 1 showed a significant increased in latency to approach a person during the path test (p<0.001), even though this was not a condition under which shocks had been delivered. Owners reported behavioral differences between year 1 and 2 in 24 of the dogs. 18 of the 24 dogs had shown no interest in sheep during that period, even though they had been interested in them during the first year tests. However, only one of those dogs had received shocks, so the change in behaviour could not be attributed to the use of the shock collar. When comparing owners’ reports for the two years, the dogs showed a weaker inclination for chasing sheep and other prey than previously (p < 0:001), but this variable was not affected by shock experience. Dogs that had shown interest in sheep in year 1 showed a persistent interest in year 2. No dogs chased or attacked sheep as their first response, while half of them did so the first year. During the entire test period, the proportion of dogs attacking sheep was reduced to almost one fourth. The number of shocks administered per dog was reduced by the second year, and only one of the dogs which received el. shocks the first year needed el. shocks also the second year.The observations that both receivers and non-receivers of el. shocks the first year showed a reduction in the probability of chasing sheep, but the receivers showing a larger reduction, show that el. shock treatment provides an additional learning response. No adverse effects on the dogs were observed with this training procedure, but in their discussion the authors commented "In order to ensure no negative effects, we recommend that the electronic dog collar may be used for such purposes only if it is used by skilled trainers with special competence on dog behaviour, learning mechanisms, and of this particular device."
Polsky study (2000) 
Polsky presented a set of five case reports based on data from legal documents relating to personal injury lawsuits involving severe attacks on humans by dogs who were being trained or maintained on an electronic pet containment system (using a shock collar). In every incident, the dog was within the "shock zone" and all fences were working; the dogs must then have received a shock. Four of the five dogs were not subject to threatening behavior by the victims prior to the attack. None of the dogs gave any kind of warning prior to biting, and all bit their victims repeatedly and seriously in the head, face, back and neck.
The analysis suggests that the dogs' aggression was caused by the shock. There are several unknown factors to the cases, including the training used to introduce the dog to the fence, the amount of time the dog spent outside unsupervised, and what level of shock intensity the dogs received. However, the reaction of the dogs, and especially the severity of the attacks, was inconsistent with their past behavior. Polsky concluded a "possible interpretation in terms of unconditioned aggression as a result of a dog having received electronic shock and avoidance-motivated aggression mediated through fear reduction toward human stimuli."
Salgirli dissertation (2008) 
The aim of Salgirli's study was "...to investigate whether any stress is caused by the use of specific conditioned signal, quitting signal, and/or pinch collars as alternatives to electric training collars, and if they do so, whether the stress produced in the process is comparable to the one with electric training collars.". The study population were a group of 42 adult police dogs. The quitting signal was a conditioned frustration equivalent to negative punishment. It was conditioned by associating failure to obtain an anticipated food reward with a specific vocal signal. In the test, dogs were walked passed a "provocateur" who attempted to taunt the dog into a reaction. If the dog reacted it was punished, and if it failed to react on subsequent provocations then the punishment was deemed to have had a learning effect. The study is therefore a comparison of negative and positive punishment methods, and not a comparison of punishment with positive reinforcement. Learning effect was measured by assessing the number of dogs that learned to quit a behaviour after application of the punishing stimulus. There was no statistical difference in learning effect between the pinch and shock collar, but the quitting signal produced a significantly poorer learning effect compared to shock or pinch collars (p<0.01 in both cases). "Although the pinch collar caused more behavioral reactions, in the form of distress, than the electronic training collar, the electronic training collar elicits more vocal reactions in dogs than the pinch collars"; the explanation for increased vocalisation in the shock collar group was that this was due to a startle response rather than pain reactions.
Salivary cortisol was monitored to measure the stress levels of the dogs, but this data was not presented in the dissertation; behavioral observation was the sole measure of stress. The study concluded that the electronic training collar induces less distress and shows stronger “learning effect” in dogs in comparison to the pinch collar. Commenting on the quitting signal, the author stated "It should particularly be mentioned, that the quitting signal training was implied only on adult dogs within the frame of this study. Therefore, the results should not be interpreted as that the quitting signal can not be a suitable method in police dog training. As previously stated training of the quitting signal requires a hard and a structured procedure. Thus, if the training, namely the conditioning, begins in puppyhood, the quitting signal can also be an effective method in police dog training". Comparing the effects of the three punishment methods; "These results can probably be explained by that electronic training collar complies completely with the punishment criteria, which were defined by TORTORA (1982), in case of proof of the proficient and experienced user. On the other hand when applying the pinch collar, these criteria can not be met even though perfect timing is applied since reactions of the dog and effectiveness of the method depends on several different factors such as the willingness, strength and motivation of the handler, as well as his/her proficiency. In addition to that, the visibility of the administrator and, thus, of the punishment is another important factor influencing the efficiency of the pinch collar because the dog directly links the punishment with its owner. Therefore this method does not satisfy the ‘’punishment criteria’’ at all. The quitting signal on the other hand requires criteria, such as good timing and structured training procedure, on account of complete conditioning in order to achieve effective results. Even if these criteria are met, the personality trait of the dog is another factor, which influences the efficiency of the signal." .
Schalke et al. study (2007) 
Schalke et al. conducted a 7-month study to investigate the effect of shock collars on stress parameters, in a series of different training situations. Heart rate and saliva cortisol were used to determine the stress levels in three groups of dogs. Group A received the electric shock when they touched the "prey" (a rabbit dummy attached to a motion device), Group H ("here" command) received the electric shock when they did not obey a previously trained recall command during hunting, and Group R (random) received random shocks that were unpredictable and out of context. Group A did not show a significant rise in cortisol levels; the other two groups (R & H) did show a significant rise, with group R showing the highest level of cortisol. Salivary cortisol was measured, as this procedure is less likely to cause stress related rise in cortisol.
From this the researchers concluded that the dogs who could clearly associate the shock with their action (i.e. touching the prey) and as a result were able to predict and control whether they received a shock, did not show considerable or persistent stress. The evidence of increased stress in the other groups was felt to support earlier findings that poor timing and/or inappropriate use of a shock collar puts the dog at high risk of severe and ongoing stress. They conclude that "The results of this study suggest that poor timing in the application of high level electric pulses, such as those used in this study, means there is a high risk that dogs will show severe and persistent stress symptoms. We recommend that the use of these devices should be restricted with proof of theoretical and practical qualification required and then the use of these devices should only be allowed in strictly specified situations."
Schilder & van der Borg study (2004) 
Schilder and van der Borg conducted a study to compare the behavior of police service dogs that had previously been trained using a shock collar (Group S) with those which had not (Group C). In the training test no shocks were applied, but the animal's behavior was observed during training tasks. The intention was to investigate whether shock collar based training might have a long term effect on stress-related behavior even in the absence of shock, and whether this related to specific features of the training context. Behaviors recorded included recognised indicators of stress (panting, lip-licking, yawning, paw lifting and body posture) as well as yelping, squealing, snapping and avoidance. During free walks on the training grounds, groups S dogs showed significantly more stress related behaviors and a lower body posture than group C dogs. During training, the same differences were found. The difference between the groups was more significant when training took place on the familiar training ground, indicating a contextual effect. The presence of the trainer was considered to be part of this context. The authors concluded "We concluded that shocks received during training are not only unpleasant but also painful and frightening."
Lindsay says of this study, "Schilder and Van der Borg (2004) have published a report of disturbing findings regarding the short-term and long- term effects of shock used in the context of working dogs that is destined to become a source of significant controversy.... The absence of reduced drive or behavioral suppression with respect to critical activities associated with shock (e.g., bite work) makes one skeptical about the lasting adverse effects the authors claim to document. Although they offer no substantive evidence of trauma or harm to dogs, they provide loads of speculation, anecdotes, insinuations of gender and educational inadequacies, and derogatory comments regarding the motivation and competence of IPO trainers in its place." 
Steiss et al. study (2007) 
Steiss, et al., conducted a four-week study of adult shelter dogs’ physiological and behavioral responses to bark control collars. Plasma cortisol was used as the stress measure. Dogs were randomly assigned to either a shock collar, a spray collar, or a dummy collar (control group). Dogs that were known to bark at an unfamiliar dog were used for the study. Test conditions involved presentation of an unfamiliar dog. Dogs wore activated collars for period of 30 minutes per day for three days in two consecutive weeks. The amount of barking was significantly reduced starting on the second day with both the spray and shock collars. There was no significant difference in effect between the two collar types. The treatment group dogs showed a mild yet statistically significant increase in blood cortisol level (an indicator of stress) only on the first day of wearing the collars (as compared to the Control Group.) At the conclusion of the study, Dr. Steiss and her team concluded that "In the present study, with dogs wearing bark control collars intermittently over a 2-week period, the collars effectively deterred barking without statistically significant elevations in plasma cortisol, compared to controls, at any of the time points measured."
Tortora Study (1983) 
Tortora applied a method called "safety training" to treat aggression in 36 cases exhibiting a form of "instrumental aggression", selected after screening a population of 476 cases. "Instrumental aggression" was defined as describing aggressive acts that "do not have a clear evolutionary significance, are not directly related to emotional arousal, do not have specific releasing stimuli, are not directly modulated by hormones, and do not have an identifiable focus in the brain". Tortora states that in the context of the article "instrumental aggression" was specifically defined as "aggressive responses that have "a specifiable learning history, show a growth function over time and are modulated by their consequences. These dogs had few operant alternatives to gain reinforcement by compliance and were channeled down a path that allowed their innate aggressiveness to come under the control of the negatively reinforcing contingencies in the environment". The dogs initially behaved as though they "expected" aversive events and that the only way to prevent these events was through aggression. The dogs were therefore a highly selected subset that had not learned strategies for coping with threat.
Each dog was trained to respond to a set of 15 commands taken from the AKC standard for CDX obedience. The commands were selected to provide control over the dog, and included "heel", "stand" "go", "come", "hold", "drop" and "sit". These behaviors were termed "safety behaviors". Training was divided into 9 stages, each of which was composed of 5-20 twice daily training sessions. Dogs could only progress to the next stage after passing a test. On average, dogs took 10-15 sessions to complete each stage. After training basic commands, the dogs were trained to perform the behaviors they had already learned in order to avoid progressively increasing electric shock. After that, they were conditioned to perform a safety behavior in order to avoid a "safety tone" that allowed them to anticipate the shock. In the later stages of training, dogs were exposed to provocation by a distractor dog, and were punished using full intensity shock if they failed to perform a safety behavior or if they showed aggression. After training was complete, and the dog's were choosing to perform the safety behaviors instead of aggression, owners were taught to use the shock collar and the training was transferred into everyday situations. The training resulted in a long-lasting and complete suppression of aggressive behaviour in the dogs. Dogs were followed up 3 years after the end of training, and the reduction in aggression were maintained.
In an editorial for the Journal Of Veterinary Behavior, Karen Overall, Associate Professor of Behavioral Medicine at the University of Pennsylvania School of Veterinary Medicine, and diplomate of the American College of Veterinary Behavioural Medicine has criticised the use of shock collars, saying "Absolutely, without exception, I oppose, will not recommend, and generally spend large amounts of time telling people why I oppose the use of shock collars, prong collars, choke collars, and any other type of device that is rooted in an adversarial, confrontational interaction with the dog. Without exception, such devices will make my anxious patients worse and allow the anger level of my clients to reach levels that are not helpful and may be dangerous".
PETA opposes the use of shock collars, stating "Dogs wearing shock collars can suffer from physical pain and injury (ranging from burns to cardiac fibrillation) and psychological stress, including severe anxiety and displaced aggression. Individual animals vary in their temperaments and pain thresholds; a shock that seems mild to one dog may be severe to another. The anxiety and confusion caused by repeated shocks can lead to changes in the heart and respiration rate or gastrointestinal disorders. Electronic collars can also malfunction, either administering nonstop shocks or delivering no shocks at all".
No scientific study supports PETA's position that shock collars can cause "injury (ranging from burns to cardiac fibrillation), and psychological stress..." or that a shock collar can "lead to changes in the heart and respiraton rate or gastrointestinal disorders."
The Companion Animal Behaviour Therapy Study Group (CABTSG), an affiliate group of the British Small Animal Veterinary Association (BSAVA) has produced a policy statement on the use of shock collars, stating "Their effectiveness depends upon the pain and fear experienced by the animal, but to use them correctly requires detailed understanding of behaviour and its motivation, as well as very precise timing. Few operators are able to achieve any reliable success with these devices and the consequences of failure can be a worsening of the problem behaviour.The indiscriminate use of shock collars therefore poses a threat to the safety of the general public, as well as to the welfare of the animal. We believe that sufficient alternative methods of treatment exist that such electronic training devices are redundant. Therefore, as an association affiliated to BSAVA, it is our duty to recommend that shock collars and all other related training and control aids should be banned from sale or use".
The BSAVA itself produced a statement on the risks associated with collars "In principle, the British Small Animal Veterinary Association (BSAVA) opposes the use of electronic shock collars for training and containment of animals. Shocks received during training may not only be acutely stressful, painful and frightening for the animal but also may produce long term adverse effects on behavioural and emotional responses.".
There is no scientific study that supports the BSAVA's claim of potential "long term adverse effects on behavioral and emotional responses."
The Association of Chief Police Officers (ACPO), in the UK, called on all forces to suspend use of the collars on the advice of the RSPCA and other animal welfare groups.
The Kennel Club has an ongoing campaign to achieve a ban on the sale and use of shock collars; "The Kennel Club in calling upon the Government and Scottish Parliament to introduce an outright ban on this barbaric method of training dogs.".
The World Union of German Shepherd Clubs (WUSV) has joined the Kennel Club in calling for a complete ban on shock collars, and passed a motion to exclude this equipment from any of its training branches 
The Royal Society for the Prevention of Cruelty to Animals commissioned a review of the effects of shock collars from the Department of Veterinary Medicine at Bristol University, which is available online. It states "Given the lack of scientific evidence for the efficacy of behavioural modification using shock collars, particularly in the long term, in addition to the potential for mistakes or deliberate abuse and the difficulty in correcting such errors, the widespread use of these devices must be carefully considered." 
The Humane Society of the United States (HSUS) provides the following comment on the use of aversive collars (choke chains, pinch collars and shock collars): "Some trainers use aversive collars to train "difficult" dogs with correction or punishment. These collars rely on physical discomfort or even pain to teach the dog what not to do. They suppress the unwanted behavior but don't teach him what the proper one is. At best, they are unpleasant for your dog, and at worst, they may cause your dog to act aggressively and even bite you. Positive training methods should always be your first choice." They go on to comment on shock collars specifically: "The least humane and most controversial use of the shock collar is as a training device. The trainer can administer a shock to a dog at a distance through a remote control. There is a greater chance for abuse (delivery of shocks as punishment) or misuse (poor timing of shocks). Your dog also may associate the painful shock with people or other experiences, leading to fearful or aggressive behavior".
The potential for shock collars to have a negative impact on behaviour has been recognised by the UK courts. In 2001 Ostarra Langridge was prosecuted after one of her dogs attacked and killed a shitzu whilst on a walk. A control order, rather than a destruction order, was imposed as the magistrates accepted the defense that Ms. Langridge's dog's aggressive behaviour was attributable to the effects of the shock collar. "Ms. Langridge sought the help of a behaviourist when her dogs started to run away from her on their walks along the beach. The dogs were given shock collars, which Miss Langridge was told to keep on for three months and activate whenever they misbehaved. But the first time the dogs got a shock was by mistake, after a small dog they were walking past made Miss Langridge jump. From then on her pets associated the shocks with small dogs and became afraid of them. When Miss Langridge described the day in July when her dogs turned on a shihtzu she had tears in her eyes.". She stated ""They connected the pain of the electric shock with little dogs because of the first time I used the collar. The day that machine came in this house I regret." 
The Norwegian Council on Animal Ethics "recommends the introduction of a ban electric training collars and similar remote-controlled or automatic electronic devices that cause your dog substantial discomfort. It should nevertheless be granted an exemption for such training carried out by authorized persons in order to prevent hunting of livestock and wildlife." 
The APDT says, "[Electronic] training collars should not be used by novice dog owners or by trainers who are not properly instructed in their use. Use of electronic training collars can result in trauma to your dog and generally are not recommended by positive reinforcement trainers".
The American Veterinary Society of Animal Behavior has produced a position statement titled "The use of punishment for behavior modification in animals", the opening paragraph of which reads "AVSAB’s position is that punishment (e.g. choke chains, pinch collars, and electronic collars) should not be used as a first-line or early-use treatment for behavior problems. This is due to the potential adverse effects which include but are not limited to: inhibition of learning, increased fear-related and aggressive behaviors, and injury to animals and people interacting with animals." 
Steven Lindsay's book, mentioned below, was published two years before the papers by Schalke (et al.) and Steiss (et al.).
In his 2005 textbook on training and behavior, Steven Lindsay writes "Instead of instilling social aversion and anxiety ... animal and human research supports the notion that competent shock [collar] training appears to promote positive social attachment, safety, and reward effects that may be provided and amplified via affectionate petting and reassuring praise. The preponderance of scientific evidence suggests that [electrical stimulation] escape/avoidance and pain reduction should promote long-term effects that are incompatible with fear and stress, making the trainer an object of significant extrinsic reward that actually enhances the dog's welfare via an improved capacity for social coping, learning, and adaptation".
Steven Lindsay states "If minimizing the intensity, duration, and frequency of aversive stimulation during training is recognized as a significant factor in the definition of humane dog training, then the radio controlled e-collar must be ranked as one of the most humane dog-training tools currently available" 
Randall Lockwood PhD, Senior Vice President, Anti-cruelty Initiatives and Legislative Services, The American Society for the Prevention of Cruelty to Animals (ASPCA) was quoted in a 2007 White Paper titled "The Facts About Modern Electronic Training Devices," produced by Radio Systems, a manufacturer of shock collars, "We recognize that older products were often unreliable and difficult to use humanely. But we feel that new technology employed by responsible manufacturers has led to products that can be and are being used safely and effectively to preserve the safety and well-being of many dogs and strengthen the bond with their human companions. "
"The International Association of Canine Professionals (IACP) strongly opposes legislation that bans or limits the humane use of any training tool, saying It is our conviction that limiting the humane use of training tools would result in a higher incidence of nuisance and dangerous dog behavior, and more dogs being surrendered to already over-burdened public shelters.... Dog training is a very diverse field with a single common thread: communication. Dogs are trained for many different tasks such as assisting the disabled, police work, herding, hunting, protection, competition and companionship. Professional trainers achieve these training goals by using a wide variety of tools to communicate with the dog, both at close range, and over long distances. Done effectively, this communication increases desirable behaviors and reduces the incidence of problem behaviors in dogs.... Any efforts to ban or limit the use of training tools would hinder this communication, and our ability to train dogs would suffer. Working dogs would no longer be able to achieve highly specialized tasks, and families with pet dogs would have fewer options available to correct behavioral problems.... Training tools, when properly utilized, are safe and humane".
The National Institute of Canine Experts (NICE) says, "NICE recognizes that there are many appropriate training techniques, methods and philosophies for each individual dog, depending upon its breed, its temperament, its age, the behavioral problems it poses, and the goals of its training. We are against arbitrary restrictions on methods, techniques or tools used in the training of dogs.... The National Institute of Dog Training Experts, strongly opposes the restriction, limitation or banning of electronic dog training equipment and containment products. Humanely used electronic dog training equipment had been demonstrated to be an effective, efficient, benign training tool for a variety of difficult performance venues beginning with its birth as a training device almost 40 years ago for hunting hounds, upland bird dogs and retrievers.... The popularity of its use as a training device has been successfully implemented and demonstrated by our nation’s military, domestic law enforcement and most recently with its successful employment as a device for behavior modification and rehabilitation for pet dogs. It’s wide acceptance and use in competitive dog sports has generated achievement at the highest levels of recognition for obedience competitors, field trial competitors, protection sport enthusiasts and others.... In any area where the performance of the dog must be RELIABLE, PRECISE, and HIGHLY CONTROLLED off-leash and/or at a distance from the handler, modern electronic dog training equipment is recognized as the premier training tool that humanely and effectively achieves such difficult goals.... In addition, activities where the preservation of human life depends on the dogs’ performance off leash in real-world environments in a precise and reliable manner, electronic dog training methods remain the most efficient technique for attaining such excellence.
Public control 
There are some organizations which promote and support the use of shock collars and are opposed to legal limitation, restriction or ban on these devices. At this time, there are likewise dog obedience schools and training programs that incorporate shock collars into their curriculum.
As of March 24, 2010, the Welsh Assembly voted to ban the use of shock collars in Wales. At present it is the first, and only, constituent country of the United Kingdom to do so.  This ban was challenged by Petsafe, a manufacturer of these devices, and the Electronic Collar Manufacturers' Association, on the basis that it breached Article 1 of the First Protocol of the European Convention of Human Rights. The challenge was unsuccessful.
On April 11, 2011, a 48 year old man from Ogmore-by-Sea became the first person convicted of illegal use of a shock collar in Wales He was subsequently fined £2,000 and assessed £1,000 for court costs.
- (Lindsay 2000, p. 136)
- Lindsay, Steven R. (2005), Handbook, Ames, Iowa: Blackwell Publishing, p. 569
- Klein, Dieter R., 2000, How Dangerous are Remote Stimulation Devices for the Training of Dogs?” Amtstierärztlicher Dienst und Lebensmittelkontrolle
- , Radio Systems White Paper 2007.
- , Table 2, Radio Systems White Paper 2007.
- Innotek. "Innotek patent".
- FDA. "FDA Compliance enforcement".
- Christiansen, Frank O., Bakkenb, Morten, Braastadb, Bjarne O., 2001, Behavioural differences between three breed groups of hunting dogs confronted with domestic sheep . Applied Animal Behavior Science, Volume 72(2), pp. 115-129. .
- Christiansen, Frank O., Bakkenb, Morten, Braastadb, Bjarne O., 2001, Behavioural changes and aversive conditioning in hunting dogs by the second-year confrontation with domestic sheep. Applied Animal Behavior Science, Volume 72, pp. 131-143. .
- Polsky, R., 2000, Can aggression in dogs be elicited through the use of electronic pet containment systems? Journal of Applied Animal Welfare Science. 3(4), pp. 345-357.
- Schalke, E., Stichnoth, J., Ott, S., Jones-Baade, R., 2007, Clinical signs caused by the use of electric training collars on dogs in everyday life situations. Applied Animal Behaviour Science 105, pp. 369-380.
- Schilder, M.B.H., van der Borg, J.A.M, 2004, Training dogs with help of the shock collar: short and long term behavioral effects. Applied Animal Behaviour Science 85, pp. 319-334.
- Lindsay, Steven R. (2005), Handbook, Ames, Iowa: Blackwell Publishing, pp. 611–612
- Steiss, J.E., Schaffer, C., Ahmad, H.A., and Voith, V.L., 2007, Evaluation of Plasma Cortisol Levels and Behavior in Dogs Wearing Bark Control Collars. Applied Animal Behaviour Science 106, pp. 96-106.
- Karen Overall. "Editorial Commentary in Journal of Veterinary Behavior".
- PETA. "Electric Fences and Shock Collars".
- CABTSG. "CABTSG Policy Statement".
- BSAVA. "BSAVA Statement".
- Kennel Club. "Kennel Club Campaign".
- WUSV. "WUSV Ban".
- Casey and Blackwell. "RSPCA Review".
- HSUS. "HSUS statement".
- The Argus. "Collars turned dogs into killers".
- NCAE. "Norwegian Council on Animal Ethics".
- APDT. "APDT".
- AVSAB. "AVSAB Position Statement".
- Lindsay, Steven R. (2005), Handbook, Ames, Iowa: Blackwell Publishing, p. 586
- Radio Systems. "Radio Systems White Paper".
- IACP. "IACP Position Paper on Training Tools".
- NICE. "NICE Positions".
- "Wales the first part of the UK to ban pet shock collars". BBC News. 2010-03-24. Retrieved 2012-12-28.
- Welsh Ban. "Welsh Ban Challenge".
- "Shock collar found on pet dog roaming on Vale beach". BBC News. April 18, 2011.
- "Ogmore illegal shock collar dog owner gets £2,000 fine". BBC News. July 18, 2011.
- Lindsay, Steven R. (2000), Handbook of Applied Dog Behavior and Training 1, Blackwell, p. 136.
- Schilder, Matthijs B.H.; van der Borg, Joanne A.M. (2004), "Training dogs with help of the shock collar: short and long term behavioural effects", Applied Animal Behaviour Science 85 (3–4): 319–334, doi:10.1016/j.applanim.2003.10.004.
- Lindsay, Steven (2005), Handbook of Applied Dog Behavior Vol 3, Blackwell, pp. 557–633.
- Polsky, R.H. (2000), "Can aggression be elicited through electronic pet containment systems", Journal of Applied Animal Welfare Science 3 (4): 345–357, doi:10.1207/S15327604JAWS0304_6.