Marvelous innit, if i were to feed my dogs that combination, they would be climbing walls, and i would be scraping it off walls t boot, the only time i mix a complete is with red mills tracker at 20% protein, with this i supplement, either fresh mince, or sardines, i cannot see the point of adding anything to a complete with a protein content of 32%, but im unfamiliar with bull breeds, so each to their own