Guinea pigs are highly social animals frequently kept in inadequate conditions that cause chronic stress and health problems.
Guinea pig welfare is systematically underestimated because these small animals tolerate poor conditions without obvious behavioral breakdown. But chronic stress from isolation, inadequate space, inappropriate diet, and barren environments accumulates silently. Providing bonded pairs or groups, adequate space, a hay-based diet with fresh vitamin C sources, and hiding spots transforms guinea pig welfare. Switzerland's legal requirement for social housing reflects the scientific consensus on their social needs.