Short answer: A guinea pig can eat rabbit pellets in a pinch for a day or two, but rabbit pellets should not be a long-term food. Guinea pigs can’t make their own vitamin C, and most rabbit pellets don’t have enough added for them, so a steady rabbit-food diet can lead to scurvy.
Why Rabbit Pellets Aren’t Right for Guinea Pigs
Rabbits and guinea pigs are both plant eaters, and their foods sit side by side in the pet store, so it’s easy to assume they’re interchangeable. They aren’t. The biggest difference is vitamin C.
- Vitamin C: Rabbits make their own. Guinea pigs can’t, so they must get it from food every day. Guinea pig pellets add stabilized vitamin C; rabbit pellets generally don’t add enough.
- Vitamin C fades: It breaks down over time once a bag is made and opened, so even guinea pig pellets lose strength on the shelf. Check the “best by” date and use a bag within a few months.
- Other ingredients: Some rabbit mixes contain extras, such as seeds, dried fruit, or colored bits, that guinea pigs don’t need. Plain, uniform pellets are the better choice for either animal.
What Happens If Your Guinea Pig Eats Rabbit Pellets
A few pellets from a rabbit bag, or a day or two of rabbit food when you’ve run out of the right food, is not an emergency. Offer plenty of fresh hay and vitamin C-rich vegetables (bell pepper is a favorite) in the meantime, and get proper guinea pig pellets as soon as you can.
Over weeks, a diet short on vitamin C can cause scurvy. Watch for these signs:
- Lethargy or reluctance to move
- Sore, swollen, or stiff joints
- Rough coat, poor appetite, or weight loss
- Bleeding or swollen gums
If you see any of these, call a vet who sees exotic pets. Don’t wait it out.
What a Healthy Guinea Pig Diet Looks Like
- Grass hay, unlimited: This should be most of the diet. It keeps teeth worn down and digestion moving. See our guide to hay for guinea pigs.
- Plain guinea pig pellets, measured: Choose a timothy-based pellet made for guinea pigs, with stabilized vitamin C listed on the label. Feed a small, measured portion daily.
- Fresh vegetables every day: Leafy greens, bell pepper, and similar choices add vitamin C and variety. Here’s a list of healthy vegetables for guinea pigs.
- Fruit only as an occasional treat: It’s high in sugar.
- Clean water, always.
For the full picture, read what guinea pigs eat.
What About the Other Way Around?
Rabbits can eat guinea pig pellets for a short time, but they need a higher-fiber diet and should live mostly on hay. If you keep both species, feed each its own food. Curious about other small pets? We’ve also covered whether chinchillas can eat guinea pig pellets.
Bottom Line
Rabbit pellets are fine as a short-term backup but not as a regular diet for a guinea pig. Stick with fresh hay, plain guinea pig pellets with added vitamin C, and daily vegetables, and keep the right food on hand so you never have to improvise.
This article is general information, not veterinary advice. If your guinea pig stops eating or seems unwell, call your vet.
