Quick answer
Watermelon may fit only as a tiny occasional amount for cats. It should not replace the normal diet.
Use a tiny occasional amount only. This should not become a daily food.
Fruit safety check
Can Cats Eat Watermelon?
Watermelon may fit only as a tiny occasional amount for cats. It should not replace the normal diet.
Preparation
Remove rind and seeds.
Watch-outs
Watery fruit may soften stool.
Why this answer changes by species
Cats usually rely on complete cat food. That makes watermelon different from a generic human-food answer, especially around plant-heavy treats, dairy, alliums, and flavored leftovers.
Related foods for cats
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Sources used
FAQ
Can cats eat watermelon?
Watermelon may fit only as a tiny occasional amount for cats. It should not replace the normal diet.
How should watermelon be prepared for cats?
Remove rind and seeds.
What should I watch for with watermelon and cats?
Watery fruit may soften stool.