A shock collar is a type of training device used on pets, particularly dogs, to modify behavior. It delivers a mild electric shock to the animal when it engages in unwanted behaviors, such as barking excessively or wandering off. The collar is typically controlled by a remote, allowing the owner to administer the shock at their discretion. These collars often come with adjustable settings, enabling the owner to choose 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 alternatives, such as positive reinforcement, are often recommended.