Made specifically for dogs prone to allergies. Some dogs may be highly sensitive to commonly used proteins, carbohydrates and food additives in their diet. Natural Balance "Potato and Duck" formula combines a single source of animal protein that most dogs have not been exposed to, and a single source of carbohydrate not commonly found in dog foods, along with effective natural ingredients to help rebuild the dog's immune system. This food does not contain corn, soy, wheat, eggs, white rice, dairy, or sunflower oil.