Dogs are omnivores. They can survive on milk products, bread and other stuff. It is not healthy for them, the main source of their food should be meat. But if you use some other food in moderation, it can have great benefits for their health and life in general. One of the best food you can give him in addition to meat is fruit.
But there is some food, that can harm them and some can even kill our four legged friends. You should never feed your dog with these: Grapes, Raisins, Avocado, Onion, Garlic, Raw Potatoes, Mushrooms, Cherries, Tomatoes and Plums:
On the other hand, you should give your dog some of these fruits from time to time: Apples, Blueberries, Sweet potatoes (they are different from normal potatoes), Watermelon, Cantaloupe, Spinach, Brussels Sprout, Carrot, Pear, Pineapple: