Guinea Pig Care for Beginners (and the Vitamin C Rule)

🐹 The short version: guinea pigs are gentle, chatty herd animals — and genuinely beginner-friendly, with two non-negotiables that catch people out. They can’t make their own vitamin C (so it has to come from the diet every day), and they must never live alone. Add unlimited hay, lots of floor space, and a cool room (17–20°C), and they’re one of the most rewarding first pets there is — for 5–8 years.

🔧 Tools for your guinea pig: what can it eat? · does it need a friend? · is my cage big enough?

The vitamin C rule (this is the big one)

Unusually among pets, guinea pigs cannot make or store their own vitamin C — so it must come from their diet every single day, or they develop scurvy (weakness, a rough coat, sore joints, poor healing). Get it from:

• a fresh daily portion of grass-based guinea-pig pellets, and
• a daily variety of vitamin-C-rich vegetables (leafy greens and herbs).

Because vitamin C degrades in air and water, give a fresh portion each day rather than topping up a bowl — and don’t rely on vitamin drops in the water bottle (they break down fast and can put pigs off drinking). If you’re unsure your pig is getting enough, ask a vet about a proper supplement.

Company: never just one

Guinea pigs are herd animals and must not live alone — in some countries it’s even illegal to keep a solitary one. Good groupings are a neutered male with one or more females, two females, or brothers raised together. Give each pig its own hides and enough resources so lower-ranking pigs aren’t bullied.

The rest of the diet

Beyond the vitamin C, the diet is like other grazers: unlimited good-quality hay as the majority (it keeps the gut moving and wears down their continuously-growing teeth), the measured pellets, the daily greens, and only occasional small treats of fruit or root veg. Don’t overfeed pellets — too many (and too little hay) cause diarrhoea, bloating and gut disease. Constant fresh water.

Housing and temperature

Give as much floor space as you can, on a solid floor (never a grid or wire floor — it hurts their feet) with deep litter, a large exercise area and secure hides (as many as pigs, plus one). Keep them at 17–20°C: above 26°C risks fatal heatstroke, below 15°C they chill. Keep them out of direct sun, away from radiators, and free of draughts.

Health to watch

Guinea pigs are prey animals that hide illness, and their two big killers — gut upset and respiratory infection (pneumonia) — move fast. Watch for not eating, drooling (dental disease), diarrhoea or a hunched posture, and any breathing difficulty. See an exotic vet promptly, and never medicate yourself: many common antibiotics are dangerous to guinea pigs.

The honest takeaway

Guinea pigs are wonderfully easy to love once you lock in the two rules — daily vitamin C and never alone — and give them space and a cool room. Most guinea-pig health problems trace straight back to those, so you’re already most of the way there. See the full guinea pig care guide for the complete spec.

Sources & further reading

• Hayfold — guinea pig care guide — the full, fact-checked reference.
• RSPCA — guinea pig diet and environment — vitamin C, hay and housing.
• Merck Veterinary Manual — guinea pigs — dental, gut and respiratory disease, and unsafe antibiotics.