Systematic reviews of training method research consistently support positive reinforcement over aversive techniques on both welfare and effectiveness grounds.
The evidence base for positive reinforcement training has reached the level of scientific consensus supported by systematic reviews, professional body position statements, and learning theory. Dogs trained with aversive methods experience fear, anxiety, and sometimes redirected aggression — welfare harms that are unnecessary because positive reinforcement achieves identical behavioral outcomes without these costs. The persistence of aversive training methods in the face of contrary evidence reflects cultural tradition, economic investment in existing approaches, and inadequate regulation rather than genuine equipoise. Regulatory bans on shock collars in Wales, Scotland, and several European countries are evidence-based welfare protections aligned with the scientific consensus.