Horses evolved as herd animals with complex social needs. Isolation from conspecifics is one of the most common and damaging welfare failures in horse management.
Horse social welfare is frequently compromised by management practices that prioritize convenience over behavioral need. Horses kept in individual stables without visual and physical contact with conspecifics experience chronic social isolation stress that manifests as stereotypic behaviors including crib-biting, weaving, and stall-walking. These behaviors, once established, persist even when social conditions improve — they represent irreversible welfare damage from inadequate early management. Progressive weaning that allows gradual reduction of mare-foal contact, paired or group turnout for appropriate horses, and stable designs that allow social contact across fence lines significantly reduce isolation stress. The welfare case for equine social management is well-supported by evidence and achievable across most management contexts.