Watermelon is good for dogs. According to About Doggies, watermelon is an ideal treat for dogs on hot days because it has a high water content and can help fight dehydration.
Organic Facts states that watermelon is full of various vitamins such as vitamins A, D and B6. Watermelons also contain plenty of fiber, protein and potassium, which are all essential to a dog's diet. Additional beneficial nutrients found in watermelon are calcium, lycopene and beta carotene. While the pink, fleshy part of the watermelon is fine for dogs to consume, watermelon rinds and seeds are slightly toxic and should not be consumed by dogs.