Guinea pigs are highly social animals that suffer significantly when kept in isolation, yet solitary keeping remains common despite clear scientific evidence of their social needs.
Guinea pig welfare hinges on social companionship in ways that few owners appreciate at the point of purchase. The pet shop model of selling single guinea pigs in small cages has created millions of animals living in solitary, impoverished conditions. A lone guinea pig in a small cage cannot express the full range of natural behaviours - social communication, play, mutual grooming, and shared vigilance - that define a normal guinea pig existence. Dental disease is common and causes chronic pain that is masked until the animal stops eating. Regular veterinary checks including dental assessment, large paired housing, and vitamin C supplementation are the core welfare requirements.