YES, Hamsters can eat Grapes. In fact, grapes are great treats. They are tasty, and jam-packed with vitamins and minerals. A healthy supplement to your hamster’s diet. But because the relatively high content of fructose (sugar) in grapes, you can’t give your hamster free access to it. Too much fructose could upset the digestive system, causing diarrhea. With dwarf hamsters you need to be more careful, because they are prone to developing diabetes. Are Grapes Safe to Eat? Even though grapes can cause toxic reactions in dogs (acute renal failure), they are in most cases perfectly safe for hamsters to