Guinea pigs are highly social prey species whose welfare needs — including constant social companionship, spacious enclosures, and unlimited hay — are frequently misunderstood, resulting in widespread welfare failures in companion animal settings.
Guinea pig welfare failures are pervasive and largely rooted in misinformation and inadequate retail guidance. Many guinea pigs are sold as low-maintenance starter pets without disclosure of their social, spatial, and dietary requirements. The welfare consequences are predictable: solitary housing causes chronic psychological stress; small cages prevent normal locomotion and popcorning (joy-jumping); inadequate hay causes dental disease and GI stasis; vitamin C deficiency causes scurvy. Despite being small, guinea pigs have complex needs deserving the same respect given to larger companion animals. Improving guinea pig welfare requires better retail education, pet industry standards for housing size disclosure, and owner resources for evidence-based care. Rescue organizations report consistently high intake of guinea pigs from welfare-inadequate situations.