The welfare implications of dog training equipment vary enormously, with evidence that aversive tools including choke chains, prong collars, and shock collars cause harm.
Training equipment welfare is an area where the evidence is clear but practice lags considerably behind. Aversive tools work through pain and fear, and while they can suppress behavior in the short term, they create fear associations that cause lasting behavioral and welfare harms. Dogs trained with punishment-based methods show higher rates of anxiety, aggression, and stress responses than those trained with positive reinforcement. Force-free training professionals have demonstrated that any behavior achievable through aversive methods can be achieved more humanely and durably through positive reinforcement. Regulatory reform of the training industry is urgently needed.