I'm not really sure why you are trying to make your dog bigger unless he is a rescue and was emaciated. How about how to make the dog healthier? Grain free & Corn free diet. Canidae and Wellness are great brands. A raw food diet for dogs is the best thing but it can get expensive. Remember, keep a dog lean. An overfed, overweight dog is not a happy dog and in turn will carry a lot of health problems.