Sheep were long dismissed as simple creatures with little cognitive sophistication, but research has revealed remarkable memory, emotional complexity, and social intelligence that demands a re-evaluation of farming practices.
The cognitive sophistication of sheep means that common management practices cause more psychological suffering than previously appreciated. Social disruption through frequent mixing and separation of groups activates chronic stress responses. Isolation for veterinary procedures, lambing pens, or transport represents significant psychological stress. Cognitive bias testing in sheep has revealed that chronic pain or poor living conditions create pessimistic cognitive states — a validated indicator of negative welfare. Farms that maintain stable social groups, minimize unnecessary mixing, and provide enrichment see behavioral benefits reflecting improved psychological welfare. The evidence now firmly supports treating sheep welfare as including significant psychological dimensions beyond physical health.