Guinea pigs are highly social, vocal rodents with specific social and environmental needs. Understanding their welfare requirements helps owners provide appropriate care for these popular small animals.
Guinea pig welfare is frequently compromised by the mismatch between the care information provided at point of sale and what these animals actually require. Standard pet store cages are commonly too small, sold food is often nutritionally inadequate, and single-animal purchase is common despite strong evidence for their social nature. Guinea pigs who are cold, in pain from dental disease, isolated, or in barren small enclosures do not vocalize loudly or display obvious distress — they simply become quieter and less active, changes that owners may not recognize as welfare signals. Switzerland's legal requirement for pair housing reflects the science clearly: guinea pigs cannot thrive alone. The minimal requirements for adequate guinea pig welfare include a same-sex companion, appropriate cage size, unlimited hay, fresh vegetables, and vitamin C supplementation.