Guinea pigs are highly social animals that suffer when kept alone, yet the welfare implications of their social needs are frequently not communicated at the point of sale.
The social needs of guinea pigs represent a fundamental welfare requirement that is routinely violated in conventional keeping. These animals evolved in groups and use constant social interaction for foraging coordination, predator detection, and emotional regulation. A guinea pig kept without companions is deprived of a basic behavioral need, resulting in chronic stress that manifests as increased fearfulness, reduced activity, and behavioral abnormalities. The problem is compounded by pet shops that sell single guinea pigs as 'starter pets' or children's gifts without adequate communication of their social needs. Even when kept in pairs or groups, guinea pigs require compatible companions - incompatible animals forced to cohabit face different welfare risks from aggression.