Guinea Pig Care Guide: Pairs, Cage Size, Vitamin C and Health Signs
Guinea pigs are social, chatty and fairly hardy, but they have a few non-negotiable needs. Here is what to get right from day one.
Guinea pigs do best kept in pairs or small groups, in a large, solid-floored enclosure, with unlimited hay, fresh vegetables, fortified pellets and a reliable daily source of vitamin C, which they cannot make themselves. With good care they commonly live around 5 to 8 years.
The sections below cover housing, diet, handling and the warning signs to watch for. This is general guidance; contact your veterinarian, ideally one experienced with small mammals, about your own guinea pigs.
Why guinea pigs need company
Guinea pigs are herd animals. They communicate constantly with squeaks, purrs and “wheeks,” and a guinea pig kept alone misses out on that contact. Animal welfare organizations recommend keeping at least two.
- Two females usually live together well.
- Two males often get along best if they grew up together; groups of several males are more likely to fight.
- A neutered male with one or more females is another common setup.
Do not house guinea pigs with rabbits. The two species have different diets and behavior, and some diseases can pass between them.
Cage size and setup
Most commercial “starter” cages are too small. The Merck Veterinary Manual recommends at least 7 square feet of floor space for one guinea pig (about 42 x 24 inches), adding 2 to 4 square feet for each extra animal, with a height of about 18 inches. Many owners go well beyond that, which is a good idea: guinea pigs exercise by running laps, not climbing.
- Choose a solid floor. Avoid wire-mesh floors, which can injure their feet.
- Pick safe bedding. Paper-based bedding, fleece liners or kiln-dried pine work well. Avoid cedar and untreated pine, sawdust and cat litter.
- Add hides. Provide at least one hide per guinea pig so nobody gets cornered.
- Place the cage carefully. Keep it indoors or in a sheltered spot, out of direct sun and drafts. Merck suggests a temperature of roughly 65 to 75°F; guinea pigs are prone to heatstroke.
- Set up food and water. A heavy ceramic bowl for pellets, a hay rack or pile, and a water bottle or bowl cleaned daily.
See the Merck Veterinary Manual’s guinea pig housing guide for more detail.
Diet: hay, vegetables, pellets and vitamin C
Like rabbits, guinea pigs have teeth that never stop growing, and chewing hay keeps them worn down and the gut working. VCA Animal Hospitals summarizes a healthy diet as an unlimited quantity of hay, a smaller amount of vitamin C-fortified pellets and a variety of fresh produce.
| Food | How much | Tips |
|---|---|---|
| Grass hay (such as timothy) | Unlimited | The bulk of the diet; replace daily |
| Fresh vegetables | A varied portion every day | Leafy greens and bell peppers are good vitamin C sources |
| Guinea pig pellets | A small measured amount | Plain, fortified with vitamin C; use fresh stock |
| Fruit | Occasional treat | Small pieces only; high in sugar |
The vitamin C question
Guinea pigs, like humans, cannot produce their own vitamin C. Without enough, they can develop scurvy, with signs such as a rough coat, sore or swollen joints, reluctance to move, weight loss and dental problems. Vitamin C also breaks down over time, so pellets lose potency as they age and vitamin drops added to drinking water degrade quickly.
Because needs vary with age, health and pregnancy, ask your vet whether your guinea pigs need a supplement and in what form. The VCA guide to feeding guinea pigs explains the options.
Do not feed rabbit food to guinea pigs; it is formulated differently and usually lacks added vitamin C.
Handling and daily life
Guinea pigs can be nervous at first but often become very tame. To pick one up, slide one hand under the chest and use the other to support the rear, then hold them close to your body. Sitting on the floor is safest, especially with children, because a fall can cause serious injury.
Give your guinea pigs daily time in a larger, safe area to run and explore, plus tunnels, cardboard boxes and piles of hay to forage in. Brush long-haired breeds regularly, and ask your vet to check or show you how to trim nails.
Cleaning routine
- Daily: remove wet bedding, droppings and uneaten fresh food; refresh hay and water.
- Weekly: replace all bedding, wash fleece liners and scrub the enclosure with mild, pet-safe cleaner, rinsing well.
Dirty bedding builds up ammonia, which can irritate the airways.
Health signs that need a vet
Guinea pigs are prey animals and tend to hide illness until it is advanced. Contact your vet promptly, or an emergency or exotics vet if your clinic is closed, if you notice:
- Not eating or drinking, or fewer droppings than normal.
- Labored or noisy breathing, discharge from the eyes or nose, or sneezing.
- Sitting hunched with fluffed fur, lethargy or unwillingness to move.
- Diarrhea, a bloated belly or straining to pass urine.
- Drooling, overgrown teeth or difficulty chewing.
- Hair loss, crusty skin or constant scratching.
- Rapid weight loss; weighing your guinea pigs weekly on a kitchen scale helps you spot it.
Our article on how to choose a veterinarian explains how to find a clinic that treats small mammals.
Bottom line
Guinea pigs are sociable, expressive pets, but they need a companion, more floor space than most cages offer, hay at all times and a dependable source of vitamin C. Weigh and watch them regularly, and see a vet early if anything changes. If you are comparing small pets for a family, see our guide to the best small pets for kids.
FAQ
Can I keep just one guinea pig?
Welfare organizations recommend keeping at least two, because guinea pigs are social herd animals. A single guinea pig relies entirely on you for interaction, which is hard to provide all day.
How long do guinea pigs live?
Guinea pigs commonly live around 5 to 8 years with good care, and some live longer.
Can guinea pigs eat rabbit food?
No. Rabbit pellets are formulated differently and usually do not contain the added vitamin C that guinea pigs need.
Do guinea pigs smell?
Guinea pigs themselves do not smell strongly. Odor usually comes from bedding that needs changing, so daily spot cleaning and a weekly full change keep it under control.