just looked at Diamond ingredients and its not really that great.
Meat meal, ground corn, wheat flour, poultry by-product meal, chicken fat (preserved with mixed tocopherols), beet pulp, fish meal, natural chicken flavor, potassium chloride, salt, choline chloride, vitamin E supplement, iron proteinate, zinc proteinate, copper proteinate, ferrous sulfate, zinc sulfate, copper sulfate, potassium iodide, thiamine mononitrate, manganese proteinate, manganous oxide, ascorbic acid, vitamin A supplement, biotin, calcium pantothenate, manganese sulfate, sodium selenite, pyridoxine hydrochloride (vitamin B6), vitamin B12 supplement, riboflavin, vitamin D supplement, folic acid.
meat meal?? doesn't even say what kind of meat....
ground corn and wheat flour

poultry by product meal?? doesn't say what kind of poultry and by-products are gross.
that's enough for me to not feed this.