Training methods based on positive reinforcement achieve better welfare outcomes and equally or more effective results than aversive methods across a wide range of species.
Training method choice is one of the most direct welfare variables in the management of companion animals, zoo animals, laboratory animals, and livestock. Aversive methods work — in the sense that they suppress behaviour — but they work by creating fear and pain, which are welfare costs that do not disappear when the training session ends. Positive reinforcement achieves equivalent or better behavioural outcomes with the opposite welfare profile: animals that are trained through reward show approach rather than avoidance behaviour, more exploratory activity, and lower baseline stress. This is not a minor welfare preference but a clear welfare improvement available through a change in practice.