Can Dogs Eat Mushroom Soup? Thinking to yourself, can dogs eat cream of mushroom soup? A small amount shouldnt hurt, but its not a good food to give to dogs regularly, if at all. Mushroom soups are typically loaded with cream or dairy which can cause stomach issues in dogs, especially those with lactose intolerance. In addition, cream of mushroom soup is high in salt and contains garlic, both of which can prove harmful to dogs.