Evidence consistently supports positive reinforcement training as the most effective and humane method for companion animals, with punishment-based methods causing fear, aggression and reduced welfare.
Aversive training methods including shock collars, choke chains and physical punishment cause acute pain and chronic fear in companion animals. Fear-based learning creates negative associations that generalise to training contexts and relationships with owners. Dogs trained with positive reinforcement show better mental health indicators including lower cortisol, higher exploratory behaviour and stronger human-animal bonds. Punishment-based methods are never necessary for any training goal.