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No, mice should not eat lemons. PetMD lists citrus fruit among foods mice should not have, and the Ontario SPCA warns that the acid in citrus can cause mouth sores and stomach upset in small pets. Lemon is the sourest citrus of all, and the peel holds oils the ASPCA says can cause problems. A lick is not an emergency.
| Safe? | No |
| How much | None |
| How often | Never |
| Best served | Not at all: offer a strawberry sliver instead |
| Watch out for | Sore mouth, drooling, loose droppings |
Why can't mice eat lemons?
Because lemons are very acidic and mice gain nothing from them. PetMD's mouse care sheet is clear that mice should not eat citrus fruits. The Ontario SPCA explains why for small pets in general: the high acidity of citrus can cause mouth sores and digestive upset.
The vitamin C argument doesn't apply either. Guinea pigs need vitamin C from food, but the Vet Desk notes that mice make their own, so a lemon's main selling point does nothing for them.
Lemon peel, juice and lemon-flavoured food
- Lemon flesh: no. Very acidic.
- Peel and zest: no. The ASPCA lists essential oils and psoralens in lemon and says the skins and plant material can cause problems, with vomiting, diarrhoea and skin irritation in pets.
- Lemon juice: no, and never in the water bottle.
- Lemon curd, lemon cake, sweets: no. Sugar and fat on top of the acid.
- Lemon-scented cleaners near the cage: rinse well after use. Mice have sensitive noses and walk on every surface.
What if my mouse has eaten some lemon?
Usually nothing serious happens. The ASPCA says small amounts of citrus fruit are unlikely to cause more than a minor stomach upset.
- Remove the rest. Take out any lemon, peel or juice-soaked bedding.
- Give fresh water. Check the bottle or bowl is full and flowing.
- Watch for a day. Look for pawing at the mouth, drooling, not eating or loose droppings.
- Ring a vet if signs appear. Call if the mouse stops eating or has diarrhoea for more than a day, or if it ate a lot of peel.
Who should avoid it most?
All mice, but especially young mice, mice with sore mouths or dental problems, and any mouse with a sensitive stomach.
What to give instead
For a fruit treat, a fingernail-sized piece of strawberry or pip-free apple is a better choice. The same thinking applies to oranges, and tomatoes are acidic too. For the full list, see what can mice eat, the pet mouse diet guide and our pet mouse care guide.
Lemon questions
Do mice hate the smell of lemon?
No welfare source we trust has tested this, so treat claims about lemon as a mouse repellent with doubt. What we do know is that the peel is full of aromatic oils, which is a good reason not to use lemon-scented sprays inside or near the cage. Clean with hot water and an unscented pet-safe cleaner instead, and let surfaces dry before the mice go back in.
Can mice eat lemon peel?
No. The ASPCA says lemon skins and plant material contain essential oils and psoralens that can cause vomiting, diarrhoea and skin irritation in pets. Peel is also tough and bitter, so there is no benefit to a mouse at all.
Can I add lemon juice to my mouse's water?
No. Mice need plain, clean water, and the RSPCA says it must always be available. Flavouring it can put a mouse off drinking, and tiny animals dehydrate quickly. Change the water daily and clean the bottle and spout each time.
