Small amounts of fruit, such as apple (seeds removed), bananas, blueberries, watermelon, strawberries, and cantaloupe, are safe for cats to eat. The fruits are a healthy snack when they're consumed as a treat only occasionally, since they provide vitamins and water. Grapes, raisins, cherries and citrus fruits could have adverse effects on cats; avoid giving them to your pet. Slices of fruit are always the best size.