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No, guinea pigs should not eat cat food. Cat food is made from meat and animal fat, usually at 28 to 34% protein, and guinea pigs are strict plant-eaters that cannot digest animal protein properly. A stolen biscuit or two is unlikely to cause harm, but take the bowl away and watch your guinea pig closely for the next 24 hours.
| Safe? | No |
| How much | None |
| How often | Never |
| Best served | Not at all: feed guinea pig pellets |
| Watch out for | Diarrhoea, bloating, not eating, fewer droppings |
Why can't guinea pigs eat cat food?
Because it is made for a meat-eater, and a guinea pig is the opposite. A vet-reviewed guide on The Vet Desk explains that cat food is built around whole meat, meat meals and animal fat, typically with 28 to 34% protein, and guinea pigs lack the enzymes to make use of animal protein. The same source warns of digestive upset, including diarrhoea, bloating and cramping.
Burgess describes guinea pigs as entirely vegetarian, and Guinea Lynx says meat should never be fed. Their gut runs on fibre from hay and grass, and a load of rich, fatty food upsets the bacteria that keep it working. Guinea pigs also cannot vomit, so whatever goes in must pass all the way through.
Cat food also misses what guinea pigs do need. They must get vitamin C from food every day, and guinea pig pellets are made with it added. Cat food is not designed to supply it.
Wet food, dry biscuits, treats and kitten food
- Dry cat biscuits: no. The most common accident, because they get scattered.
- Wet cat food: no. Meat and gravy, often with more fat.
- Cat treats and milk: no. Burgess lists dairy as particularly dangerous for guinea pigs.
- Kitten food: no, and even richer.
What to do if your guinea pig ate cat food
- Take it away. Pick up the bowl and any scattered pieces.
- Guess how much. A biscuit or two is a different matter from a mouthful of wet food.
- Give hay and water. Plenty of fresh hay helps keep the gut moving.
- Watch for 24 hours. The Vet Desk advises close monitoring for a day. Look for eating less, smaller or softer droppings, diarrhoea, a hunched posture or a swollen belly.
- Ring your vet if anything changes. The PDSA says to call promptly if a guinea pig stops eating or has severe diarrhoea. Ring straight away if a lot was eaten or your guinea pig is young, old or already unwell.
Take a photo of the cat food label before you ring the vet. The ingredients and protein figure help them judge the risk quickly.
Living with cats and guinea pigs
Most accidents happen during floor time in a shared room. Feed the cat out of reach, pick up bowls before the guinea pigs come out, and keep the two apart. Our guide to guinea pig floor time covers setting up a safe space.
What guinea pigs should eat instead
Unlimited hay, about one cup of fresh veg a day and about a tablespoon of guinea pig pellets, as set out in our guinea pig diet guide. Our vitamin C guide explains why pellets made for guinea pigs matter. For other animal foods, see our pages on chicken and cheese, and for the full list, what can guinea pigs eat and our guinea pig care guide.
Cat food questions
Can guinea pigs eat dog food?
No, for the same reasons as cat food. Dog food is built around meat and animal fat, which a guinea pig's plant-eating gut cannot use properly, and it is not made with the vitamin C guinea pigs must get from food every day. Treat a stolen bite of dog food the same way as cat food.
Can guinea pigs eat rabbit food?
Not as their main food. Guinea Lynx advises against rabbit pellets because they lack the vitamin C guinea pigs need. Rabbit food is plant-based, so a mouthful will not do the harm cat food can, but guinea pigs should always have pellets made for guinea pigs.
My guinea pig ate a few cat biscuits. Do I need a vet?
Probably not straight away. A vet-reviewed guide on The Vet Desk says a small accidental bite is unlikely to cause harm but should be watched for 24 hours. Ring your vet if your guinea pig stops eating, has diarrhoea or a swollen belly, or if more than a few pieces went down.
How do I stop my guinea pig eating the cat's food?
Feed the cat somewhere the guinea pig never goes, such as a worktop, a windowsill or a room that stays shut during floor time. Pick up the cat's bowl before guinea pig floor time, and never leave dry cat food out in a shared room overnight.
