Guinea pigs are highly social animals whose welfare is fundamentally compromised by solitary housing, and understanding their social requirements is essential for responsible keeping.
Guinea pig social welfare is one of the clearest cases in companion animal welfare: solitary housing causes documented, measurable harm through elevated stress indicators, reduced behavioral diversity, and apparent distress vocalizations. Despite this clear evidence, single guinea pig keeping remains common. The solution is straightforward - provide at least one compatible companion - but requires planning for introductions, adequate space, and consideration of neutering for mixed-sex groups. Welfare standards and veterinary advice should consistently recommend pair or group housing as a baseline requirement.