Guinea pig food
A guinea pig's diet is built around unlimited hay, a small daily portion of a nugget-style food such as Supreme Science Selective Guinea Pig Junior or Burgess Excel Guinea Pig Blackcurrant Oregano, and fresh vegetables, with vitamin C a genuine dietary need since guinea pigs can't make their own the way many other animals can.
Why hay matters more than the pellet food
Hay should make up the majority of a guinea pig's diet by volume, not the pellet food — it's essential for their constantly growing teeth and digestive health, and should be available at all times rather than given as an occasional extra. Products like Burgess Excel Guinea Pig Nuggets with Mint are formulated to be fed alongside unlimited hay, not instead of it.
A guinea pig fed mostly on pellets or muesli with too little hay is at real risk of dental and digestive problems over time, so if you're only changing one thing about a guinea pig's diet, making sure hay is genuinely unlimited is the place to start.
Nuggets versus muesli-style mixes
A uniform nugget, like Mr Johnson's Advance Guinea Pig, stops a guinea pig from selectively eating only the tastiest pieces and leaving the rest, which is a real problem with a loose muesli-style mix — many guinea pigs pick out the bits they like and leave behind the ingredients that were balancing the diet.
If you're moving from a muesli mix to a nugget, do it gradually over a week or two, since guinea pigs can be genuinely resistant to a sudden change in their food.
Vitamin C and fresh food
Guinea pigs need a dietary source of vitamin C, since they can't produce it themselves, and a guinea pig-specific food is formulated with that in mind — a food made for rabbits is not a substitute, since rabbits don't have the same requirement.
Fresh vegetables offer another route to vitamin C alongside their food, but introduce anything new gradually and in small amounts, watching for any change in their stools before making it a regular addition.
Common questions
- Can I feed my guinea pig rabbit food instead?
- No, not as their main food — guinea pigs need a dietary source of vitamin C that they can't produce themselves, and guinea pig-specific foods are formulated with that in mind, while rabbit food typically isn't. Stick to a food made specifically for guinea pigs.
- Should I feed a nugget or a muesli-style mix?
- A uniform nugget is generally the better choice, since a loose muesli mix lets a guinea pig pick out the tastiest bits and ignore the rest, which can unbalance their diet over time. If you're switching from muesli to nuggets, do it gradually.
- How much hay does a guinea pig actually need?
- Hay should be available at all times and make up the majority of their diet by volume, not just an occasional extra alongside pellets. It's essential for their constantly growing teeth and digestive health.
- Can guinea pigs eat too many fresh vegetables?
- Too much fresh food, or a sudden large amount of something new, can upset a guinea pig's stomach, so introduce anything new gradually and in modest amounts. Fresh vegetables are a good addition to their diet, not a replacement for hay and their regular food.
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Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.