Guinea pigs are among the most commonly kept small animals, but their welfare needs — particularly for social companionship — are widely misunderstood, leading to preventable suffering.
Guinea pig welfare is most commonly compromised by two misunderstandings: that they can live alone, and that small cages are acceptable. As prey animals that form strong social bonds in the wild, solitary guinea pigs experience chronic isolation stress; Switzerland recognized this by making social companionship legally mandatory. Traditional pet shop cages are a fraction of the space guinea pigs need for normal locomotor behavior; wheel exercise is not a substitute as guinea pigs are not wheel-appropriate animals. Vitamin C deficiency from inadequate fresh vegetable provision causes scurvy — a painful, preventable disease. Guinea pigs rarely show obvious pain, which means welfare problems can persist for extended periods without owner awareness. Education at point of adoption and welfare-conscious marketing by retailers are the most upstream welfare interventions.