Guinea Pig Care Guide: Everything You Need to Know
Guinea pigs — also called cavies — are vocal, personable, and surprisingly social animals. When properly cared for, they recognize their owners, vocalize enthusiastically at feeding time (a sound called "wheking"), and live 5–7 years as active household companions. They're often presented as easy starter pets, but they have specific needs — particularly around diet, vitamin C, companionship, and space — that require real commitment.
| Need | Requirement |
|---|---|
| Companionship | 2+ guinea pigs — never alone |
| Minimum Space | 7.5 sq ft for 2 piggies (most store cages inadequate) |
| Diet | Unlimited hay + fresh veg + limited pellets |
| Vitamin C | Daily — must come from diet (bell peppers, greens) |
| Lifespan | 5–7 years |
| Vet Access | Exotic/small animal vet required |
The Vitamin C Imperative
This is the most critical and most overlooked aspect of guinea pig care. Like humans, guinea pigs cannot synthesize vitamin C and must consume it daily — 50 mg for maintenance and up to 100 mg when sick. Deficiency causes scurvy: rough coat, swollen joints, reluctance to move, bleeding gums. It develops within weeks of inadequate intake and is entirely preventable.
The best sources: red or yellow bell peppers (the highest vitamin C vegetables), romaine lettuce, kale, parsley, and cilantro. Vitamin C drops in water bottles degrade rapidly with light exposure and are unreliable. Fresh vegetables are the most dependable delivery method.
Diet: The Same Hay-First Rule
Like rabbits, guinea pigs need unlimited grass hay (timothy or orchard grass) to maintain gut motility and dental health. Their teeth grow continuously throughout life; hay wears them naturally. Fresh vegetables provide vitamin C and variety. Pellets should be guinea pig-specific and vitamin C-fortified, in limited quantities — around 1/8 cup per guinea pig per day. Avoid muesli-style mixes (selective feeding leads to nutritional gaps) and most fruit (too sugary).
Frequently Asked Questions
Can guinea pigs be kept alone?
No — guinea pigs are highly social herd animals and should not be kept alone. A single guinea pig will be lonely and stressed. Always keep at least two same-sex guinea pigs, or a neutered male with females.
Do guinea pigs need vitamin C?
Yes — unlike most mammals, guinea pigs cannot synthesize their own vitamin C and must get it from their diet daily. A deficiency causes scurvy, which is painful and preventable. Fresh vegetables high in vitamin C (bell peppers, leafy greens) should be offered daily.
How big should a guinea pig cage be?
At minimum, 7.5 square feet for two guinea pigs, but larger is always better. Most commercially sold cages are too small. C&C (cubes and coroplast) cages are popular and allow custom sizing.