A social South American cavy
Guinea Pig
Guinea pigs are domesticated South American rodents known for social vocal behavior, plant-based diets, continuously growing teeth, and a long history with Andean peoples and household care.
What a guinea pig is
A guinea pig is a domesticated rodent, also called a cavy. Despite the name, it is not a pig and it does not come from Guinea. Guinea pigs have compact bodies, short limbs, no visible external tail, rounded ears, and teeth that keep growing throughout life.
Origins and domestication
Domestic guinea pigs come from South American cavies and are strongly associated with the Andes. Their likely wild ancestry is connected to Andean Cavia species, and they were domesticated long before they became familiar pets in Europe and North America. In different cultures, guinea pigs have been companions, food animals, research animals, and teaching animals.
Body and senses
Guinea pigs are built close to the ground, with sturdy bodies and short legs. They do not climb like many small pets, but they move quickly through cover and use hearing, smell, and social calls to track their surroundings. Their continuously growing teeth require steady chewing on fibrous foods.
Diet and digestion
Guinea pigs are herbivores. A healthy diet centers on grass hay, fresh water, suitable greens, and species-appropriate pellets. Vitamin C is especially important because guinea pigs, like humans, cannot synthesize enough of it. Too little fiber or vitamin C can quickly become a health problem.
Housing and enrichment
Good housing gives guinea pigs room to run, hide, forage, and rest. They need soft bedding or flooring that protects their feet, hiding places, tunnels, chew materials, and regular cleaning. Because they are prey animals, open spaces without shelter can feel unsafe.
Health and handling
Guinea pigs can hide illness, so changes in appetite, droppings, weight, breathing, movement, or behavior need attention. Gentle handling matters because their backs and legs can be injured by falls or rough restraint. Regular veterinary care helps manage teeth, skin, digestion, and nutrition.
Why it matters
Guinea pigs matter because they show how domesticated animals carry both biological needs and cultural histories. Understanding them well prevents neglect, improves welfare, and connects pet care with broader questions about domestication, nutrition, social behavior, and human responsibility.
Social behavior
Guinea pigs are social animals with many vocal signals, including wheeks, purrs, rumbles, squeals, and chirps. They often do best with compatible companionship, careful introductions, and enough space so each animal can retreat. Social needs vary by individual, but isolation can be stressful.