Guinea pigs are gentle, vocal, and hugely rewarding pets — but their care requirements are more complex than many new owners expect. They have a unique dietary need (Vitamin C), are highly social, and require more space than commonly provided. This guide covers the essentials based on the latest UK welfare guidance and the 2024 Royal Veterinary College (RVC) health study.
The Vitamin C Requirement
Guinea pigs, like humans, cannot produce their own Vitamin C. Deficiency causes scurvy — swollen joints, lethargy, poor coat, weight loss, difficulty walking, and increased infection susceptibility.
- Adults need 10–20mg daily; pregnant guinea pigs need 30–40mg
- Best dietary sources: bell peppers (red and green), parsley, kale, spring greens, pak choi
- Vitamin C in pellets degrades quickly — don’t rely on it as the sole source
- Do NOT add Vitamin C to water — it breaks down rapidly when exposed to light and air
Must Live in Pairs or Groups
Guinea pigs are herd animals and must never be kept alone. Reputable rescues will not rehome a single guinea pig. The best pairing is two neutered males or two females. Bond on neutral territory with multiple hideaways.
Housing
- Minimum cage: 120cm × 60cm for two guinea pigs — but bigger is always better
- Smooth-bottomed (no wire) to prevent bumblefoot
- Added levels do not substitute for floor space — guinea pigs are not climbers
- Indoor housing preferred (temperature control, predator protection, easier interaction)
Diet — 80–90% Hay
- Unlimited Timothy Hay — essential for digestion and dental wear
- Daily cup of Vitamin C-rich fresh vegetables
- Small amount of guinea pig pellets (one eggcup/20g per pig per day)
- Fresh water always available (bottle with sipper tube, changed daily)
FAQs
What are the most common guinea pig health problems?
The 2024 RVC study found that the most common issues in UK guinea pigs are: overgrown nails (affecting over 25% annually — regular trims essential), ringworm (fungal skin infection), eye ulcers (often from hay poking), dental disease (insufficient hay causes tooth overgrowth), respiratory infections (URIs — can be fatal if untreated), and bumblefoot (painful foot sores from wire cage floors or lack of exercise). Most of these are preventable with proper husbandry, diet, and housing.
