I think most fish food is just processed crude proteins and fats with flavors added. I utilize Macaw hand feeding formula mixed with either fresh meat or canned dog food/cat food when working with a dog or cat that needs fast weight gain, or is sick and will not eat at all. Macaw hand feeding formula is also crude protein/fat. Therefore, the fish food probably will not hurt your dog. Might make him/her plump up quickly though if you can afford to go through that much fish food.