The Five Domains welfare model provides a comprehensive framework for assessing horse welfare covering nutrition, environment, health, behaviour and mental state.
Equine welfare assessment requires attention to all five welfare domains because horses in good physical health may still experience poor mental welfare through isolation, boredom or inability to perform motivated behaviours. Competition horses face specific welfare pressures from training intensity, transport and competition environments. Pleasure horses may be well-fed but understimulated. Applying the Five Domains systematically to individual horses identifies specific welfare deficits requiring targeted intervention. The quality of the human-horse relationship is unique among farm animals in its importance as a welfare determinant.