Horses are highly social animals for whom isolation causes significant stress, and understanding their social needs is fundamental to equine welfare.
Equine social isolation is a welfare harm that is frequently normalized in traditional horse keeping. The individual stable system, where horses are kept alone in adjacent boxes with limited contact, deprives them of the physical social contact - mutual grooming, companionship, and synchronized behavior - that is central to equine wellbeing. Moving toward systems that allow genuine social contact, even if logistically more complex, is an important welfare advance. Where isolation is unavoidable, visual contact, companions, and enrichment can mitigate but not eliminate the welfare cost.