Stereotypic behaviours in horses — crib-biting, weaving, box-walking — are welfare indicators that are best prevented through early management intervention.
Stereotypy prevention requires addressing the management conditions that create them rather than suppressing the behaviours once established. The evidence consistently implicates three factors: early weaning (particularly abrupt weaning before six months), restricted forage access, and social isolation. Young horses in their first winter of life are particularly vulnerable — a period when many are first stabled extensively, transitioned to concentrate feeds, and separated from companions. Providing continuous forage access, social companionship (even visual and olfactory contact if direct interaction is impossible), and delayed or gradual weaning can prevent stereotypy development in most cases. Anti-weave bars, anti-crib collars, and other physical preventives treat symptoms without causes and may increase frustration in animals for which the underlying drive remains unsatisfied.