Guinea pigs are highly social, vocal animals whose welfare is routinely compromised by solitary housing, inadequate space, and vitamin C deficiency. Evidence-based care dramatically improves outcomes for these popular companion animals.
Guinea pig welfare failures are almost universally preventable with appropriate education. The three most common causes of preventable suffering — solitary housing, vitamin C deficiency, and inadequate space — are all entirely within owner control once identified. Guinea pigs in solitary confinement show depression-like behavioral changes, reduced activity, and reduced lifespan compared to paired animals. Vitamin C deficiency causes joint pain that owners may not recognize because guinea pigs stoically continue superficially normal behavior until late in disease progression. The Swiss legal requirement for minimum two guinea pigs reflects evidence-based welfare science that many countries have yet to implement.