A shock collar is a type of training device used primarily for dogs. It delivers a mild electric shock to the animal when triggered by a remote control or automatically when the dog engages in undesired behavior. The purpose of the shock collar is to discourage unwanted actions, such as barking or running away, by associating them with an unpleasant sensation. These collars often come with adjustable settings, allowing the owner to control the intensity of the shock. While some trainers advocate for their use, others raise concerns about the potential for causing fear or anxiety in pets. Proper training techniques and humane alternatives are often recommended.