Species · Herbivore grazer
Guinea Pig
Cavia porcellus
The chatty herd sweetheart — never happy alone, powered by hay and vitamin C, and wheeking for salad.
Difficulty: BeginnerPrintable care sheet →
Guinea pigs are the wheeking, popcorning sweethearts of the small-pet world — herd animals that chatter for their salad, rarely bite, and bond deeply with their own kind. The catch is that they’re quietly demanding: unlike almost every other pet, they can’t make their own vitamin C, so it has to come from their diet every single day, and a lone guinea pig is a lonely one. This is the honest guide — what’s normal, what’s urgent, and what the pet shop got wrong.
They are social animals that naturally prefer living in groups.
Care at a glance
| Adult size | Adults weigh roughly 815–1,000 g (about 1.8–2.2 lb) and measure around 20–50 cm (8–19 in) nose-to-rump depending on breed — a solid, tail-less body built low to the ground. |
|---|---|
| Lifespan | Typically 5–8 years — much longer than most rodents, so this is a real multi-year commitment, not a short one. |
| Enclosure | As much floor space as you can give, on a solid floor (never a grid or wire floor — it hurts their feet) with a good depth of litter. Guinea pigs run rather than climb, so floor area matters far more than height, though they need room to stand fully upright and youngsters need about 30 cm of headroom for their happy “popcorn” hops. Include a large exercise area plus secure shelters and hides — they feel exposed in open space — with as many hiding places as pigs, plus one. |
| Companionship | Guinea pigs are herd animals and must never be kept alone — in some countries it is even illegal to keep a solitary one. Good groupings include a neutered male with one or more females, two females, or brothers raised together (unrelated males can work but take patience). Any male kept with females must be neutered. Give every pig its own escape/hiding spots and enough food, water and shelter for all, so lower-ranking pigs aren’t bullied. If one must temporarily live alone, it needs daily human company as a stopgap. |
| Temperature | Room temperatures of 17–20°C are ideal. Guinea pigs cope badly with temperature swings: above 26°C they risk heatstroke, and below 15°C they get chilled and should be moved indoors. Keep them out of direct sun, away from radiators, and free of draughts. |
| Bedding & substrate | A solid floor with a generous, deep layer of dry, dust-free, absorbent wood shavings topped with plenty of hay to tunnel and hide in; wood wool also makes good hiding material. Never use a grid floor. Provide enough bedding throughout to keep them warm, and spot-clean often — guinea pigs like their toilet area kept separate. |
| Enrichment & exercise | They’re active grazers that need room and reasons to move: give free access to an exercise area with pipes, tunnels and shelters to run, stand up, stretch out and forage. Provide safe things to gnaw — their teeth and claws grow continuously and wear down through use — and scatter or hide food to encourage natural foraging. Hides and quiet refuges keep a nervous pig calm. |
| Grooming & upkeep | Guinea pigs rarely need bathing unless genuinely soiled (use a small-animal shampoo, never human shampoo, and dry thoroughly). Long-haired breeds need regular brushing to prevent painful matting. Check teeth and claws for overgrowth — a vet can trim them, but plenty of hay and gnaw items prevents most problems before they start. |
| Diet | Good-quality hay and/or grass makes up the majority of the diet and must be available at all times — it keeps the gut moving and wears down their continuously-growing teeth. Add a fresh daily portion of grass-based guinea-pig pellets and a daily variety of vitamin-C-rich fresh vegetables and herbs. Vitamin C is the make-or-break nutrient: guinea pigs can’t make or store their own, so it must come from the diet every day — and because vitamin C degrades in air, give a fresh portion of pellets and greens each day rather than topping up the bowl. Provide constant fresh water (check twice daily). Don’t overfeed pellets: too many (and too little hay) cause diarrhoea, bloating and gut disease. |
| Supplements | The critical one is vitamin C, and it should come from the daily diet (fresh grass-based pellets plus vitamin-C-rich vegetables). Don’t rely on vitamin drops in the water bottle — vitamin C breaks down quickly in water and can put pigs off drinking. If you’re unsure your pig is getting enough, ask a vet about a proper supplement rather than guessing. |
🤎 Did you know? — Guinea Pig fun facts
Little true delights about the guinea pig — each one checked against a named source, no pet-shop myths.
- Like us, guinea pigs can’t make their own vitamin C and must get every bit of it from their food.Merck Veterinary Manual
- Guinea pig pups are born ready to go — fully furred, eyes open, and nibbling solid food within days.Animal Diversity Web
- The guinea pig no longer exists in the wild — it’s a fully domesticated animal, bred by people for thousands of years.Animal Diversity Web
What it's like to live with a Guinea Pig
Living with guinea pigs is a noisy delight — they “wheek” loudly when they hear the fridge or your footsteps, rumble and chatter to each other, and “popcorn” (leap and twist) when they’re happy. They’re ground-dwelling herd animals, not climbers, so they want space to run and company to run with. Because they’re prey animals they hide illness until it’s advanced, and their two big killers — gut upset and respiratory infection — can move fast, so learning each pig’s normal appetite, weight and droppings is the single most protective habit you can build.
Your first month together
The settling-in period, in order — so you know what's normal and when not to worry.
- Let them settle in a quiet spot before much handling; win trust with food and gentle, low contact rather than chasing or grabbing.
- Keep their existing diet at first, then move to a hay-first diet with fresh daily vitamin-C greens and pellets — introduce new vegetables gradually.
- Learn each pig’s normal (appetite, weight, droppings, breathing) and weigh them weekly — steady weight loss is often the first sign of dental or gut trouble.
- Find a guinea-pig-savvy exotic vet now, and note that many common antibiotics are dangerous to guinea pigs — never medicate without one.
- Make sure every pig has its own hides and resources so no one is bullied, and bond new pigs carefully with plenty of space.
Through the year, and as they grow
Heat is the summer danger — above 26°C guinea pigs can suffer fatal heatstroke, so keep them cool, shaded and never in a hot room or car. In winter, protect them from cold and damp and bring outdoor pigs in below 15°C, reintroducing them outside only once it’s warm enough again. Respiratory infections spread more easily in stuffy or crowded conditions year-round.
Popular guinea pig breeds
All guinea pigs are one species; breeds differ mainly in coat. Whatever the breed, every guinea pig still needs a companion, unlimited hay and a daily source of vitamin C — coat is really the only thing that changes the day-to-day.
- American (English) — A short, smooth coat — the low-maintenance classic and an easy first guinea pig.
- Abyssinian — The coat grows in rosettes and swirls, which traps a little more debris — so a bit more brushing and spot-cleaning.
- Peruvian / Silkie (Sheltie) — A long, flowing coat that needs daily grooming and often trimming to stay clean, dry and mat-free.
- Teddy / Rex — A dense, springy, wiry coat that is low-grooming but worth checking to the skin for dryness or mites.
- Skinny / Baldwin (hairless) — Little or no fur. Needs extra warmth, protection from sun and cold, and a bit more food, because it burns more energy keeping warm.
These are appearance breeds, not different species — the core care is identical. The care-relevant points (grooming long coats, extra warmth for hairless) are covered in the guinea pig care guide on this page.
The pet store gets these wrong
Common myths, kindly corrected — no shame for having believed them.
- Guinea pigs can’t live alone. They’re herd animals and need at least one guinea-pig companion — in some countries keeping just one is illegal.
- They genuinely need vitamin C every day. Unlike most pets they can’t make their own, so a diet without a fresh daily source leads to painful deficiency (scurvy).
- Hay isn’t optional or “just bedding” — it’s the majority of the diet and what keeps their teeth and gut healthy. A dry-mix-and-pellets diet with little hay causes disease.
- Pet-shop cages are usually far too small. Guinea pigs need lots of floor space to run and popcorn, not a starter box.
- They’re not low-maintenance “easy kids’ pets” you can forget — they live 5–8 years and need daily fresh food, company and a specialist vet.
Before you buy
- Are you getting two or more — never a single guinea pig?
- Can you give a large, solid-floored space with room to run, plus daily exercise time?
- Can you commit to a fresh daily source of vitamin C (grass-based pellets + fresh greens), every day?
- Can you keep them between 15–26°C year-round, out of heat and cold?
- Do you have a guinea-pig-savvy exotic vet (dental and respiratory problems are common, and many antibiotics are unsafe for them)?
- Are you ready for a 5–8 year commitment?
See a vet if…
We can't diagnose from afar — but these are the signs to stop watching and get a professional:
- Not eating, drooling (“slobbers”), or dropping weight — often dental disease, and a guinea pig that stops eating needs a vet quickly
- Any difficulty breathing, sneezing, or nasal/eye discharge — respiratory infection and pneumonia are a leading cause of death and can progress fast; see a vet immediately
- Diarrhoea, small or no droppings, bloating, a hunched posture, rough fur or staining around the rear — gut upset, which can decline rapidly
- Watering, crusting or redness of the eyes (conjunctivitis)
- Head tilt, circling, loss of balance or ear discharge (ear infection)
- Hair loss with low appetite and energy in a female over one year (possible ovarian cysts)
- Any new lump, especially in a guinea pig over 5 years old
Never
- Never keep a guinea pig on its own — it needs the company of other guinea pigs.
- Never house them on a grid or wire floor — it causes painful foot injuries.
- Never let them get above 26°C or below 15°C.
- Never feed rabbit, hamster or other rodent food instead of guinea-pig food — it lacks the vitamin C they need.
- Never give a diet without a fresh daily source of vitamin C.
- Never give any medication without a guinea-pig-savvy vet — many common antibiotics can be fatal to them.
Common guinea pig questions
How hard are Guinea Pigs to keep — are they good for beginners?
Beginner. A gentle, chatty and genuinely beginner-friendly herd animal — but with two non-negotiables that catch people out: they need daily vitamin C in their diet (they can’t make their own), and they must live with at least one other guinea pig. Get those right, plus plenty of floor space and a hay-first diet, and they’re one of the most rewarding first pets there is.
What do Guinea Pigs eat?
Good-quality hay and/or grass makes up the majority of the diet and must be available at all times — it keeps the gut moving and wears down their continuously-growing teeth. Add a fresh daily portion of grass-based guinea-pig pellets and a daily variety of vitamin-C-rich fresh vegetables and herbs. Vitamin C is the make-or-break nutrient: guinea pigs can’t make or store their own, so it must come from the diet every day — and because vitamin C degrades in air, give a fresh portion of pellets and greens each day rather than topping up the bowl. Provide constant fresh water (check twice daily). Don’t overfeed pellets: too many (and too little hay) cause diarrhoea, bloating and gut disease.
How big an enclosure do Guinea Pigs need?
As much floor space as you can give, on a solid floor (never a grid or wire floor — it hurts their feet) with a good depth of litter. Guinea pigs run rather than climb, so floor area matters far more than height, though they need room to stand fully upright and youngsters need about 30 cm of headroom for their happy “popcorn” hops. Include a large exercise area plus secure shelters and hides — they feel exposed in open space — with as many hiding places as pigs, plus one.
Do Guinea Pigs need a companion, or can they live alone?
Guinea pigs are herd animals and must never be kept alone — in some countries it is even illegal to keep a solitary one. Good groupings include a neutered male with one or more females, two females, or brothers raised together (unrelated males can work but take patience). Any male kept with females must be neutered. Give every pig its own escape/hiding spots and enough food, water and shelter for all, so lower-ranking pigs aren’t bullied. If one must temporarily live alone, it needs daily human company as a stopgap.
What temperature do Guinea Pigs need?
Room temperatures of 17–20°C are ideal. Guinea pigs cope badly with temperature swings: above 26°C they risk heatstroke, and below 15°C they get chilled and should be moved indoors. Keep them out of direct sun, away from radiators, and free of draughts.
What bedding and substrate do Guinea Pigs need?
A solid floor with a generous, deep layer of dry, dust-free, absorbent wood shavings topped with plenty of hay to tunnel and hide in; wood wool also makes good hiding material. Never use a grid floor. Provide enough bedding throughout to keep them warm, and spot-clean often — guinea pigs like their toilet area kept separate.
What enrichment and exercise do Guinea Pigs need?
They’re active grazers that need room and reasons to move: give free access to an exercise area with pipes, tunnels and shelters to run, stand up, stretch out and forage. Provide safe things to gnaw — their teeth and claws grow continuously and wear down through use — and scatter or hide food to encourage natural foraging. Hides and quiet refuges keep a nervous pig calm.
What grooming and upkeep do Guinea Pigs need?
Guinea pigs rarely need bathing unless genuinely soiled (use a small-animal shampoo, never human shampoo, and dry thoroughly). Long-haired breeds need regular brushing to prevent painful matting. Check teeth and claws for overgrowth — a vet can trim them, but plenty of hay and gnaw items prevents most problems before they start.
What supplements do Guinea Pigs need?
The critical one is vitamin C, and it should come from the daily diet (fresh grass-based pellets plus vitamin-C-rich vegetables). Don’t rely on vitamin drops in the water bottle — vitamin C breaks down quickly in water and can put pigs off drinking. If you’re unsure your pig is getting enough, ask a vet about a proper supplement rather than guessing.
How big do Guinea Pigs get?
Adults weigh roughly 815–1,000 g (about 1.8–2.2 lb) and measure around 20–50 cm (8–19 in) nose-to-rump depending on breed — a solid, tail-less body built low to the ground.
How long do Guinea Pigs live?
Typically 5–8 years — much longer than most rodents, so this is a real multi-year commitment, not a short one.
What are the signs Guinea Pigs are sick or need a vet?
See a small-animal or exotics vet if you notice: Not eating, drooling (“slobbers”), or dropping weight — often dental disease, and a guinea pig that stops eating needs a vet quickly; Any difficulty breathing, sneezing, or nasal/eye discharge — respiratory infection and pneumonia are a leading cause of death and can progress fast; see a vet immediately; Diarrhoea, small or no droppings, bloating, a hunched posture, rough fur or staining around the rear — gut upset, which can decline rapidly; Watering, crusting or redness of the eyes (conjunctivitis); Head tilt, circling, loss of balance or ear discharge (ear infection); Hair loss with low appetite and energy in a female over one year (possible ovarian cysts); Any new lump, especially in a guinea pig over 5 years old.
Free tools for your guinea pig
Sources & further reading
This guide was written and fact-checked against these authorities. It's kind, general guidance — not a diagnosis or a substitute for an exotics vet:
- RSPCA — Creating a good home for guinea pigs — floor space, solid floor, 17–20°C, heat/cold limits, hides
- RSPCA — What to feed guinea pigs — hay-first, fresh daily vitamin-C pellets + greens, vitamin C degrades in air
- RSPCA — Guinea pig company — herd animal, groupings, neuter males with females
- Merck Veterinary Manual — Description of guinea pigs — lifespan 5–8 yr, weight 815–1,000 g, open-rooted teeth
- Merck Veterinary Manual — Routine Health Care of Guinea Pigs — bathing, long-hair grooming
- Merck Veterinary Manual — Disorders & Diseases of Guinea Pigs — dental disease, gut disease, pneumonia, ovarian cysts, unsafe antibiotics
Written and fact-checked by The Hayfold Team against veterinarian-authored sources — if your pet shows a red-flag sign above, see an exotics/small-animal vet promptly.