Guinea pigs are popular small pets whose welfare needs are frequently misunderstood. Their social requirements, space needs, and dietary complexity make them more demanding than often recognised.
Guinea pig welfare is systematically compromised by small cages sold as suitable in pet shops, inadequate diet (insufficient hay and vitamin C), and solitary housing. The welfare cost is significant: chronically under-stimulated guinea pigs in tiny cages show reduced activity, stress-related behaviours, and suffer preventable conditions like scurvy and obesity. Their social needs are particularly important - a lone guinea pig in a small cage represents a welfare failure on multiple dimensions simultaneously. Switzerland's legal requirement for social housing reflects the evidence that guinea pig wellbeing requires companionship.