What happens if a dog eats too much watermelon?

Watermelon has lots of water and fiber; too much can cause diarrhea, vomiting, or indigestion.

It also has some fructose and glucose, and too much can raise blood sugar.

Feed it in moderation; if the dog’s stomach reacts badly, give pet probiotics to regulate the gut, and if symptoms don’t ease, go to a vet.