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Only rarely. A guinea pig can have a thumb-sized piece of peeled, seedless orange once a week at most, and many owners skip it altogether. Oranges do contain vitamin C, but they are acidic and sugary, the RSPCA lists citrus among foods to avoid, and bell peppers give far more vitamin C with none of the risk.
| Safe? | Only as a rare treat, and some charities say avoid |
| How much | One piece about the size of your thumb, around 10 g (a third of an ounce) |
| How often | Once a week at most |
| Best served | Raw, peeled, seeds out |
| Watch out for | Sore lips or mouth, soft droppings |
Are oranges safe for guinea pigs?
Good sources disagree, so we take the careful line. The RSPCA puts citrus fruits on its list of things guinea pigs can't eat. On the other side, Woodgreen says oranges are safe in small amounts a few times a week (but not sharper citrus such as lemons, limes and grapefruit), VCA Animal Hospitals names orange as a vitamin C fruit, RSPCA Australia includes oranges in its fruit list, and a vet-reviewed guide at The Vet Desk allows a small segment once or twice a week.
Oranges are not poisonous. The worry is acid and sugar. Orange has about 9.5 g of sugar per 100 g (3.5 oz), worked out from the Guinea Lynx food chart, and its acid can make the lips and mouth sore if fed often. So if you give orange at all, keep it tiny and rare, and stop if you see crusty or red lips.
How much orange can a guinea pig have?
One small piece, about the size of the top of your thumb, per guinea pig, no more than once a week. Fruit of any kind should be a small treat, not part of the daily bowl: the PDSA asks for about a cup of mostly leafy vegetables a day, and fruit comes on top of that only now and then.
How to prepare orange
- Wash and peel. Wash the fruit, then remove the peel and as much of the white pith as you can.
- Take out the seeds. Pick out every pip, as they are a choking risk.
- Cut a small piece. Cut one segment in half or thirds and offer one piece.
- Clear up. Remove anything uneaten within an hour or two, before it gets sticky and attracts flies.
Peel, seeds, juice and tinned oranges
- Peel: best left out, as it is often waxed and sprayed.
- Seeds: always remove.
- Juice: no. It concentrates the sugar and acid.
- Tinned mandarins or segments in syrup: no, far too sugary.
- Lemons, limes and grapefruit: no. Woodgreen says to avoid these more acidic citrus fruits.
- Dried orange: no. Guinea Lynx warns against treats with dried fruit.
Who should avoid oranges?
Skip orange for guinea pigs with sore lips or mouth, loose droppings, a sensitive stomach or extra weight, and for young guinea pigs still settling onto greens. If yours has had a lot of orange and has soft droppings, take fruit away, give plenty of hay and water, and ring a vet if droppings stay loose for more than a day or your guinea pig stops eating. See our guinea pig health guide for other signs.
Better sources of vitamin C
Guinea pigs need 10 to 50 mg of vitamin C a day, according to VCA, and can't make their own. Bell peppers are the easiest daily source. For a fruit treat, a little kiwi or strawberries are gentler choices. Read our vitamin C guide, the full safe food list, our guinea pig diet guide and the guinea pig care guide.
Orange questions
Can guinea pigs eat orange peel?
We'd leave it out. Shop oranges are often waxed and sprayed, and the peel is tough and bitter. Some vet-reviewed guides say torn-up organic peel is fine, but it adds nothing a guinea pig can't get from hay, so there is no reason to take the chance.
Can guinea pigs drink orange juice?
No. Juice strips out the fibre and concentrates the sugar and acid, which is the worst of the fruit with none of the good. Guinea pigs should only drink fresh, plain water. Never add juice to their bottle or bowl, even to help with vitamin C.
Can guinea pigs eat satsumas, clementines or mandarins?
They are the same family as oranges, with the same acid and sugar, so treat them the same way: a small, seedless piece once a week at most, or none at all. The RSPCA lists citrus fruit among foods guinea pigs can't eat, so skipping them is never wrong.
Are oranges good for vitamin C in guinea pigs?
They contain a fair amount, about 54 mg per 100 g (3.5 oz), but the sugar and acid mean you can only give a little. Red and yellow bell peppers carry roughly two and a half to three and a half times as much vitamin C and can be fed daily, so they do the job far better.
