Guinea pigs are widely kept as pets, particularly for children, yet their welfare needs are frequently misunderstood. Good care requires understanding their social, spatial, and dietary requirements.
Guinea pig welfare suffers from a pervasive misconception that they are simple, low-need animals well suited to small cages and occasional handling. In practice, they are social, active, and behaviourally complex animals with specific dietary needs that, when unmet, lead to serious health problems. Dental disease from insufficient hay is one of the most common reasons guinea pigs present to exotic vets — a condition entirely preventable with correct diet but frequently diagnosed in animals fed primarily on pellets and insufficient roughage. Social isolation causes measurable stress. Inadequate space prevents normal locomotor behaviour including the characteristic "popcorning" (jumping and twisting) that indicates positive welfare. As pets for children, they are particularly vulnerable to welfare compromise because the responsible adult must supply what children cannot consistently provide.