Old bark collars were used primarily by hunters to keep their dogs alert during a hunt. As dogs during the early years are not as disciplined or trained like modern hunting dogs, electronic collars are utilized to "stop and shock" whenever they are diverted from their job by distractions such as chasing around other preys which usually happens all the time during hunts. Electric collars are also used to force the dog to release an animal it had retrieved for the handler. In terms of features, early electric collars are bulky, simple and have very limited technical options. Additionally, early models had only one to three levels of shock strength and once the collar has already been fastened, owners can't adjust the intensity level. The lowest level of shock was also of a higher intensity than minor corrections required.
Manufacturers of bark collars quickly recognized the draw backs of past models and began to develop a more compact and complex training collars. The success of inventing modern training collars then expanded from sporting dog owners to companion dog owners and service dog trainers. Modern developments have seen significant improvement in reliability and sensitivity. Current designs provides an adjustable electric shock, ranging from low levels of e-stim (creating a tickling or tingling effect) to medium levels (a level which annoys or startles) to high levels.
Today, training collars comes in three types and each of which utilizes different concepts of restraining dogs from excessive barking and hysteria. Barking collars are now classified as spray collars, electric collars and ultrasonic collars. Depending on the dog's breed and natural resistance, these collars has its own unique way to effectively control the dog's behavior and response in any give situation.
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