“Guinea pigs need a companion guinea pig, at least 7.5 square feet of floor space for a pair, unlimited grass hay, about a cup of fresh vegetables per pig each day, a daily source of vitamin C, and a room kept around 65 to 75°F. With that care, they live 5 to 7 years.”
Guinea pigs are gentle, chatty, and full of personality, which is why they’re one of the most popular family pets in the country. They are also closely related to the capybara, the world’s largest rodent, and share many of its needs on a smaller scale: a grass-based diet, plenty of room, and constant company. This guide covers everything a new owner needs to know, from setting up the cage to spotting early signs of illness.
Guinea Pig Quick Facts
| Trait | Details |
|---|---|
| Scientific name | Cavia porcellus |
| Origin | Domesticated in the Andes of South America thousands of years ago |
| Adult weight | About 1.5 to 2.6 pounds |
| Lifespan | 5 to 7 years, sometimes longer |
| Social needs | Must live with at least one other guinea pig |
| Activity | Active in bursts day and night, with naps in between |
| Diet | Herbivore: hay, vegetables, pellets, vitamin C |
Why Guinea Pigs Need a Friend
Guinea pigs are herd animals. In a group, they communicate constantly with squeaks, purrs, and rumbles, and they feel safer with a companion nearby. A lone guinea pig is more likely to become stressed, withdrawn, or bored. The simplest pairings are two females, two males raised together or introduced carefully, or a neutered male with one or more females. If you’re adding a new guinea pig, our guide on how to introduce two rodents walks through the process.
Housing: Space Comes First
Guinea pigs don’t climb or jump much, so floor space matters more than height. Most store cages are far too small.
- Two guinea pigs: at least 7.5 square feet, with 10.5 square feet or more preferred.
- Three guinea pigs: at least 10.5 square feet, with 13 or more preferred.
- Floor: solid, never wire, to protect their feet.
- Hides: at least one per guinea pig, so no one gets trapped or bullied.
- Location: indoors, away from drafts, direct sun, and radiators.
Many owners build cube-and-coroplast cages because they’re roomy and affordable. For layouts and bedding choices, see our detailed guinea pig cage setup guide.
Bedding
Good options include paper bedding, aspen shavings, and washable fleece liners over an absorbent layer. Avoid cedar and pine shavings, whose oils can irritate the lungs, and avoid corn cob or clay litters. Our bedding comparison explains the pros and cons of each material.
Diet: Hay, Veggies, Pellets, and Vitamin C
Hay (about 80% of the diet)
Unlimited grass hay such as timothy, orchard grass, or meadow hay keeps the digestive system moving and wears down teeth that never stop growing. Alfalfa hay is richer in calcium and protein, so it’s best reserved for young, pregnant, or nursing guinea pigs.
Fresh Vegetables
Offer about one cup per guinea pig per day, mostly leafy greens with some colorful vegetables. Bell peppers are especially valuable because they’re high in vitamin C.
Pellets
A plain, hay-based guinea pig pellet (not a colorful mix with seeds and dried fruit) adds balanced nutrition. About an eighth of a cup per pig per day is a common starting point.
Vitamin C
Like capybaras, guinea pigs can’t make their own vitamin C. Without enough, they develop scurvy. Fresh vegetables and fortified pellets usually cover it, and some owners add a vet-recommended supplement. Avoid vitamin drops in the water bottle, since they degrade quickly and can discourage drinking.
For a full list of safe and unsafe foods, read what guinea pigs can eat.
Water
Provide fresh water daily in a bottle or a heavy bowl, and check that bottle spouts aren’t clogged. Our comparison of a water bottle vs a bowl covers the trade-offs.
Daily and Weekly Care Routine
Every Day
- Refill hay and water.
- Serve fresh vegetables and remove leftovers.
- Spot clean wet or dirty bedding.
- Check that everyone is eating, pooping, and moving normally.
- Offer floor time or gentle handling.
Every Week
- Do a full bedding change or wash fleece liners.
- Wash bowls, bottles, and hides.
- Weigh each guinea pig. A steady drop in weight is one of the earliest signs of illness.
Every Month
- Trim nails.
- Check teeth, ears, eyes, and skin.
- Groom long-haired breeds regularly to prevent mats.
Handling and Bonding
New guinea pigs are often shy. Let them settle for a few days, then sit near the cage and offer vegetables from your hand. When picking one up, place one hand under the chest and the other under the rear, and hold it close to your body. Sit on the floor with young children so a wriggly guinea pig can’t fall far.
You’ll soon learn their language. A loud “wheek” usually means food is expected, “popcorning” (jumping straight up) means excitement, and teeth chattering means “back off.” Guinea pigs are one of the best choices for families, as we explain in our guide to the best rodents for kids.
Exercise and Enrichment
Guinea pigs need room to run. Supervised floor time in a safe, enclosed area gives them extra exercise and a chance to explore. Tunnels, hay piles, cardboard boxes, and scattered vegetables encourage natural foraging. Never use exercise balls or wheels, which are unsafe for their body shape.
Health Basics
Guinea pigs are prey animals and hide illness well. Watch for:
- Not eating or fewer droppings
- Weight loss
- Crusty eyes, runny nose, or wheezing
- Hair loss, scratching, or scabs
- Hunched posture or lethargy
- Drooling or overgrown teeth
A guinea pig that stops eating needs a vet the same day. Learn more in our guinea pig health problems guide, and find a qualified clinic before you need one with our tips on finding an exotic vet.
Temperature
Guinea pigs are sensitive to heat and prone to heatstroke above about 80°F. Keep them in a climate-controlled room between roughly 65 and 75°F, and never leave them in direct sunlight or a hot car.
How Much Guinea Pigs Cost
The guinea pigs themselves are inexpensive, but a proper setup and ongoing hay and produce add up. Expect a few hundred dollars for the initial setup and roughly $45 to $100 a month for a pair, plus vet care. See our guinea pig cost breakdown for details.
Frequently Asked Questions
Can a guinea pig live alone?
It’s strongly discouraged. Guinea pigs are social and do best with at least one other guinea pig.
Do guinea pigs smell?
Guinea pigs themselves are fairly clean. Odor usually comes from bedding that isn’t changed often enough.
How long do guinea pigs live?
Most live 5 to 7 years. See our guide to guinea pig lifespan.
Are guinea pigs related to capybaras?
Yes. Both belong to the cavy family. Compare them in our capybara vs guinea pig article.