Natural Balance® L.I.D. Limited Ingredient Diets® Sweet Potato & Fish Formula is a proven formula for dogs with allergies based on our unique single source protein and single source carbohydrate blend. Some dogs may be highly sensitive to commonly used proteins, carbohydrates and food additives in their diet. Allergic reactions can lead to irritable bowel, upset stomach, and a number of skin problems. Natural Balance® has created Sweet Potato & Fish formula for dogs with these food allergies. Our Sweet Potato & Fish formula combines fresh salmon, a single source of animal protein that most dogs have not been exposed to, and fresh sweet potatoes, a single source of carbohydrate not commonly found in dog foods, along with effective natural ingredients to help rebuild the dog's immune system.