Can cats eat watermelon?
Last updated 2026-05-08 · Sourced from ASPCA & Merck Veterinary Manual
The short answer
Yes — cats can safely eat watermelon. flesh only, occasional Large green-rind fruit with red, water-rich flesh.
Remember: cats are obligate carnivores. They derive almost all their nutrition from animal protein, so even "safe" plant foods are treats — not staples.
Why it's okay
Non-toxic. The high water content can be appealing to cats who don't drink enough.
How much watermelon can a cat eat?
Small flesh cube once a week max.
What every cat owner should know
- No seeds or rind
- Watch sugar with diabetic cats
How much watermelon can cats have?
Treats — including watermelon — should make up no more than 10% of daily calories. Use these portion sizes as a starting point and adjust for your cat's activity level and overall diet.
| Cat size | Recommended amount |
|---|---|
| Any cat (avg 8-12 lb) | 1 small piece (1/2 teaspoon equivalent), 1-2× per week max |
These are general guidelines — always consult your veterinarian for portion recommendations specific to your pet's health, weight, and existing diet.
Kitten safety
Watermelon is generally safe for healthy kittens once they're fully weaned (around 8 weeks). Start with very small amounts — about a pea-sized piece — and watch for any digestive upset over 24 hours before offering more. Never replace cat food with treats; growing animals need their balanced nutrition first.
What to do if your cat ate watermelon
Watermelon is generally safe in moderation. If your cat ate too much, you may see mild stomach upset (gas, soft stool) — usually resolves on its own within 24 hours. Contact your vet if you see vomiting, lethargy, or symptoms lasting more than a day.
See full emergency guideOther safe fruits for cats
If your cat likes watermelon, they may also enjoy these safe options: