Can rats eat watermelon?

Yes — safe

Yes. Watermelon is safe for rats in small pieces. Remove the seeds to be safe.

Check all 30 foods in one tap in the free Rattitude Care app. Get the app

Serving
Small piece
How to prepare
Remove seeds to be safe
Benefits
Great source of hydration.

The details

It is mostly water and sugar, which makes it a refreshing summer treat, but too much causes diarrhea. A small piece now and then is enough, and it doesn't replace fresh drinking water.

How treats fit into a rat's diet

Most of what a rat eats each day should be a complete rat pellet or nugget, weighed out from the pack guidelines. Fresh fruit, vegetables and treats come out of that daily allowance, not on top of it: the RSPCA warns that extra sugar and fat lead to obesity and health problems, and rats gain weight easily. Remove any fresh food that hasn't been eaten within a few hours.

Sources

Last updated: September 29, 2026

This guide is general information based on RSPCA and PDSA guidance and does not replace a veterinarian. If your rat seems unwell, please contact an exotic-pet vet.