Guinea pigs are popular pets whose welfare needs are frequently misunderstood. Providing appropriate social company, space, and diet makes the difference between poor welfare and genuinely good lives.
Solitary guinea pigs experience chronic social deprivation — vocalisations of isolated guinea pigs indicate distress, and isolated individuals show reduced activity and abnormal behaviour. Housing in small cages prevents running — a natural behaviour guinea pigs perform spontaneously when given adequate space. Vitamin C deficiency causes joint pain and internal bleeding; dental overgrowth causes starvation. Most of these welfare failures are entirely preventable with adequate knowledge and space. Guinea pigs are often purchased as easy starter pets for children, but their actual welfare requirements make them demanding to keep well.