Guinea pigs are popular companion animals whose social, dietary, and housing needs are frequently misunderstood, resulting in widespread chronic welfare problems in captivity.
Guinea pig welfare is compromised primarily by inappropriate housing, social isolation, and dental disease. Small pet store hutches marketed as guinea pig homes are almost universally inadequate for their space needs. Social isolation causes genuine psychological distress — guinea pigs are highly social and become lethargic, anxious, and depressed when kept alone. Dental problems (from inadequate hay consumption) cause chronic pain that owners may not recognize until severe weight loss occurs. Vitamin C deficiency from inadequate vegetable provision causes scurvy. Despite being marketed as "starter pets" for children, guinea pigs require more knowledgeable and committed care than commonly assumed. Adoption from rescue organizations rather than purchase, and thorough owner education, are the primary welfare interventions needed.