Is watermelon okay for dogs to eat?

This fourth of July, my parents 15 year old wired-haired terrior acquired a tremedous liking to the taste of watermelon. It was such a funny site. Is is okay for him to eat it?

Basically watermelons are sugars. A little will not hurt but a lot will basically do the same in your pet as it does in you. Give you a burst of enery then a let down. To many sugars (or carbs that break down into sugars) can cause obesity. Dogs can also get Diabetes so you need to be aware of that side of things too.

Thanks for the reply, yeah Snoopy just loved it, but be were weary about giving him anymore. I guess a little snack of it is okay then, thanks again!