I use Science Diet exclusively for my lab and coon hound. I feed the adult large breed. It costs more but they eat less. They digest more of it, and less comes out the back end. If you look at the protein level on it, it is not overly high. Dogs can only digest 24-26% protein. So if you buy 28% or higher, it goes out the back end. Waste of money, and of your backyard/kennel.