Species · Small Pet

Guinea Pig

Cavia porcellus

Domesticated in the Andes thousands of years ago. No longer found in the wild in this form.

Of everything on this page, guinea pigs come closest to the pet-shop promise: they rarely bite, they tolerate handling well, and children can genuinely enjoy them under supervision. Two things are non-negotiable. They must be kept with their own kind — a solitary guinea pig is a distressed one — and they cannot make their own vitamin C, so the diet is not optional. Get those right and they are lovely, chatty, undemanding animals.

At a glance

Lifespan: 5–8 years
Adult weight: 700–1200 g
Daily attention: 1–2 hrs
Alone time tolerated: Never alone
Minimum housing: 1.2 m² for two, minimum
Diet: Hay, greens, daily vitamin C
Handling: Tolerates it well
With children: Good, with supervision
With other pets: Do not house with rabbits

Breeds · 6 listed

Guinea pig breeds are coat types rather than sizes, so the practical difference between them is how much grooming you are signing up for.

American
Abyssinian
Peruvian
Silkie
Teddy
Skinny

Right for you if

You will keep two or more, always.
You want a small pet that genuinely tolerates gentle handling.
You can provide fresh vegetables daily, not as a treat.
You want something quieter and simpler than a rabbit.

Wrong for you if

You want a single pet.
Daily fresh food is more than you will keep up.
You want an animal that lives happily in a small cage — the sold sizes are too small.
You want a long-coated breed but not the daily grooming that comes with it.

The things that go wrong — read this part

Guinea pigs cannot make their own vitamin C — unlike most mammals, they need it in the diet exactly as we do¹ — so scurvy is entirely a matter of feeding, and measurable harm begins within a fortnight of going without.² Fresh vegetables daily, and supplement if your vet advises — not vitamin drops in the water, which degrade and put them off drinking.
Never house guinea pigs with rabbits. Rabbits can injure them, and apparently healthy rabbits commonly carry Bordetella bronchiseptica — isolated from 21 of 27 in one study — which causes severe lung disease in guinea pigs.³
Weigh them weekly and act on a drop. A guinea pig that goes off its food needs a vet the same day, not a wait-and-see.
Buy for two from the start. Bonding a lone adult later is possible but harder than simply starting with a pair.

Sources

Carpenter KJ. The discovery of vitamin C. Annals of Nutrition and Metabolism 2012; 61(3):259-64. International doi:10.1159/000343121 PMID 23183299 The guinea pig, like us and unlike most mammals, cannot make its own vitamin C and must get it from food — which is why scurvy was first produced experimentally in this species.
Jara N, Cifuentes M, Martinez F, et al. Vitamin C deficiency reduces neurogenesis and proliferation in the SVZ and lateral ventricle extensions of the young guinea pig brain. Antioxidants 2022; 11(10):2030. International doi:10.3390/antiox11102030 PMID 36290753 Guinea pigs on a vitamin C deficient diet showed measurable neurological damage at 14 and 21 days. A laboratory study of the brain, not a study of scurvy in pets.
Kameyama H, Fujimoto Y, Tomioka Y, et al. Pathogenicity of Bordetella bronchiseptica isolated from apparently healthy rabbits in guinea pig, rat, and mouse. The Journal of Veterinary Medical Science 2022; 84(4):574-581. International doi:10.1292/jvms.21-0494 PMID 35153249 Bordetella bronchiseptica was isolated from 21 of 27 apparently healthy rabbits, and that isolate produced severe lung inflammation in guinea pigs.

Every source here was checked, not recalled. Where this page makes a health statement and no source appears against it, that is not an oversight we have hidden — it means the claim is not yet sourced, and the build reports how many are in that state.

Availability, registration and keeping requirements differ from place to place. Check the rules where you live before you commit to any animal — we describe animals, not law.