Companion Animals

Guinea Pig Social Housing Welfare

Guinea pigs are highly social animals requiring conspecific companionship; solitary keeping causes significant welfare deficits.

Key Facts

Guinea pigs are social animals that live in groups in the wild
Switzerland has made it illegal to keep guinea pigs alone since 2008
Solitary guinea pigs show higher stress hormones and abnormal behaviours
Same-sex pairs or neutered mixed-sex pairs are recommended
Minimum recommended cage size is 120cm x 60cm for a pair, with outdoor run access

Welfare Considerations

Keeping guinea pigs in solitary confinement causes chronic stress that manifests as reduced activity, stereotypic behaviour, and immune suppression. The Swiss legal requirement for guinea pig companionship reflects scientific consensus that these animals have strong social needs. Even in countries without legal requirements, keeping guinea pigs in pairs or small groups is a fundamental welfare requirement.

What You Can Do

Always keep guinea pigs in pairs or small groups
Ensure adequate space of at least 120 x 60cm plus access to a run
Seek guidance on safe introductions when adding new guinea pigs
Neuter males if mixing sexes to prevent unwanted pregnancies
Support guinea pig rescue organisations and welfare education