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Yes, guinea pigs can eat watermelon as a treat. Give one cube of the red flesh about 2.5 cm (1 inch) across, with the seeds picked out, once or twice a week. Melon is on the PDSA and Burgess lists of safe fruit, but watermelon is mostly sugar and water with little vitamin C, so it is a treat, not a staple.
| Safe? | Yes, as a treat |
| How much | One 2.5 cm (1 in) cube of flesh |
| How often | Once or twice a week |
| Best served | Fresh, seeds out, rind off |
| Watch out for | Seeds, soft droppings, sticky fur |
Is watermelon safe for guinea pigs?
Yes. The PDSA and Burgess both list melon among the fruits guinea pigs can have, as small treats. Both stress that fruit should be given only in very small amounts because of its sugar, and VCA warns that too much fruit can upset gut bacteria and cause serious diarrhoea.
Worked out from the Guinea Lynx food chart, watermelon has about 6 g of sugar per 100 g (3.5 oz) and only about 8 mg of vitamin C. That is less sugar than banana but far less vitamin C than strawberries, which have about 59 mg. So watermelon is refreshing and safe in small amounts, but it does little for a guinea pig's daily vitamin C need of 10 to 50 mg.
How much watermelon can a guinea pig eat?
One cube of flesh about 2.5 cm (1 inch) on each side, once or twice a week per guinea pig. That weighs about 15 g (half an ounce), around half the 33 g Guinea Lynx uses as a 10-calorie portion. Don't give other fruit the same day. Because it is so watery, watermelon is the first thing to cut if droppings go soft.
How to prepare watermelon
- Wash the outside. Rinse the skin before cutting so dirt on the rind is not dragged through the flesh.
- Cut a cube. About 2.5 cm (1 inch) of red flesh, with no green skin.
- Pick out every seed. Burgess lists seeds among the foods to avoid.
- Serve on a dish. Watermelon is wet and sticky, so a small saucer keeps the bedding dry.
- Clear up within an hour or two. Cut fruit spoils quickly, especially in warm weather.
Flesh, rind, seeds and other melons
| Part or form | Okay? | Notes |
|---|---|---|
| Red flesh | Yes, as a treat | One small cube |
| Green rind and skin | We'd skip it | Not covered by our sources; tough |
| Black seeds | No | Choking risk; seeds on the Burgess avoid list |
| Juice, sweets, ice lollies | No | Sugar without fibre, or added sugar |
| Other melons | Yes, as a treat | See our melon page |
Who should skip watermelon?
Guinea pigs that are overweight, have a sensitive stomach or loose droppings, and babies not yet fully weaned are better without it.
What to offer instead
For a cooling, low-sugar crunch, cucumber is a better everyday choice. For a fruit treat with real vitamin C, try a strawberry. Our melon page covers cantaloupe and honeydew, and our guinea pig temperature guide explains how to keep them cool in summer. See also what can guinea pigs eat and our guinea pig care guide.
Watermelon questions
Can guinea pigs eat watermelon rind?
We'd leave it out. None of the welfare or vet sources we use cover the rind, the hard green skin is tough and may carry sprays, and there is no need to take the risk. If you want a low-sugar, watery crunch, cucumber does the same job and is on the RSPCA list of everyday veg.
Can guinea pigs eat watermelon seeds?
No, take them out. Burgess lists seeds among the foods guinea pigs should avoid, and hard black seeds are a choking risk for a small animal. The soft, pale seeds in seedless watermelon are less of a worry, but it is easy to pick them out too.
Is watermelon good for guinea pigs in hot weather?
A cube can be a nice cool treat, but it is no substitute for water, shade and a cool room. Keep fruit to its usual small amount even on hot days, since too much sugar and water at once can upset the gut. Our guide to guinea pig temperature covers keeping cool.
Can guinea pigs drink watermelon juice?
No. Juice is the sugar of the fruit without the fibre, and guinea pigs should only ever drink fresh, clean water. Woodgreen and the RSPCA both stress fresh water every day, and the RSPCA advises checking it twice a day.
