nc0, I can assure you that most typical dog food doesn't have an ingredient list that looks like that. Here is an example of Purina Kitty Chow. This reminds me that animal by-products are also not healthy for koi (nevermind other animals). But they are listed here:
Poultry by-product meal, ground yellow corn, wheat flour, corn gluten meal, soybean meal, brewers rice, beef tallow preserved with mixed-tocopherols (source of vitamin E), fish meal, brewers dried yeast, animal digest, phosphoric acid, potassium chloride, calcium carbonate, tetra sodium pyrophosphate, calcium chloride, choline chloride, dicalcium phosphate, salt, taurine, zinc oxide, ferrous sulfate, vitamin supplements (E, A, B-12, D-3), L-Alanine, riboflavin supplement, niacin, calcium pantothenate, manganese sulfate, biotin, thiamine mononitrate, folic acid, pyridoxine hydrochloride, copper sulfate, citric acid, menadione sodium bisulfite complex (source of vitamin K activity), calcium iodate.
Again, you can feed your animals what you wish. I'm just providing a general viewpoint of what is healthy and nutritious for a fish.