The training methods used with dogs have significant welfare implications, with aversive techniques causing fear, pain, and psychological harm that are unnecessary for effective training.
Aversive training tools including shock collars, prong collars, and choke chains cause acute pain and fear, and are associated with increased aggression and anxiety in dogs. The widespread belief that punishment-based methods are necessary for reliable training is not supported by evidence. Reward-based methods achieve equivalent or better results while avoiding welfare harm. Choosing trainers who use force-free methods is a significant welfare decision for pet dogs that undergo training.