Best Guinea Pig Food UK: A Complete Feeding Guide

Guinea pigs (cavies) are popular small pets in the UK, but their nutritional needs are more specific than many owners realise. Get the diet right and you'll have a healthy, active guinea pig. Get it wrong and you risk serious — sometimes fatal — deficiency diseases. Here's everything you need to know.

The One Thing All Guinea Pig Owners Must Know

Guinea pigs, like humans, cannot synthesise their own vitamin C. They must get it from their diet every single day. Without adequate vitamin C, guinea pigs develop scurvy — a serious condition causing joint pain, weakness, rough coat, and bleeding gums. It can be fatal.

Make sure your guinea pig gets fresh vegetables rich in vitamin C daily. The best sources include:

• Bell peppers (especially red and yellow — higher in vitamin C than green)
• Kale and spring greens
• Broccoli (in moderation)
• Parsley
• Strawberries

Don't rely on pellets alone for vitamin C — the vitamin degrades rapidly once a bag is opened. Fresh vegetables are essential.

Hay: The Foundation of the Diet

Like rabbits, guinea pigs should have access to unlimited hay at all times — ideally timothy hay or meadow hay. Hay provides the essential long-strand fibre that keeps their digestive system healthy and wears down their continuously growing teeth. A guinea pig that doesn't eat enough hay is at risk of dental and digestive problems.

Alfalfa hay is suitable for young guinea pigs under 6 months but is too high in calcium for adults — stick to timothy or meadow hay.

Fresh Vegetables: Daily Essentials

Guinea pigs should receive a small handful of fresh vegetables daily — roughly a cup per guinea pig. Good choices include:

• Romaine lettuce, cos lettuce (not iceberg)
• Bell peppers (a daily vitamin C staple)
• Cucumber and courgette
• Kale, spring greens, cavolo nero
• Fresh herbs: parsley, dill, coriander, basil
• Dandelion leaves

Introduce new vegetables gradually. Avoid iceberg lettuce (watery, low nutrition), potatoes, onions, garlic, avocado and rhubarb.

Pellets: A Small but Important Addition

A small amount of guinea pig-specific pellets — around 1–2 tablespoons per pig per day — provides consistent vitamins and minerals. Look for pellets specifically formulated for guinea pigs with added vitamin C. Don't substitute rabbit pellets — they don't contain the right nutrients.

As with rabbits, avoid muesli-style mixes which encourage selective feeding and can lead to nutritional imbalances.

Fruit: Treat Only

Fruit can be offered in very small amounts as an occasional treat — a thin slice of apple (no seeds), a strawberry, or a small piece of melon. No more than 1–2 times per week. High sugar content means fruit should never be a daily food.

Fresh Water

Always ensure fresh water is available, either in a water bottle or a heavy ceramic bowl. Change it daily. Guinea pigs that eat a lot of fresh vegetables will drink less, but water should always be accessible.

Browse our guinea pig food range at UK9 Petcare including premium hay, species-specific pellets and healthy treats.