Why guinea pigs must be kept in social groups and how to safely house compatible companions together for optimal welfare.
The scientific and ethical case for social housing of guinea pigs is compelling and has been recognized in law in Switzerland. Despite this, millions of guinea pigs continue to be sold and kept individually, often marketed to children as low-maintenance starter pets. The behavioral consequences of guinea pig solitude - elevated stress hormones, reduced exploration, and the loss of rich social communication - represent genuine suffering. The solution is straightforward: ensure guinea pigs always have at least one compatible companion. Rescue organizations can advise on appropriate pairings and introduction techniques. The cost of a second guinea pig is minimal compared to the welfare benefit.