Guinea pigs are highly social animals that suffer from isolation, yet are frequently housed alone in small cages that prevent both social bonding and adequate movement, leading to preventable chronic welfare deficits.
Guinea pig welfare encapsulates several common companion small mammal welfare failures: isolation, inadequate space, and dietary mismanagement. These are prey animals that evolved in large social groups and depend on the security of conspecific companions and adequate space for foraging and flight response. Switzerland recognized the welfare severity of guinea pig isolation by legislating against it — the only country to do so — providing a regulatory precedent that has not been widely followed. The combination of educational improvements at point of sale, species-appropriate housing guidance, and support for rescue organizations addressing the surplus of poorly kept guinea pigs represents the most effective welfare improvement pathway.