Has anyone ever used this food? We have a puppy person that wants to use it. Thoughts...? The mystery meat scares me.

Martins K9 formula

Meat & Bone Meal, Brown Rice, Brown barley, Poultry fat (preserved with mixed tocopherols and vitamin E), Whole Ground Oats, Rice Bran,Chicken Meal, Alfalfa Meal, Natural flavor, Menhaden Fish Meal, Brown Flax Seed,Sea Salt, Dried Whey, Cheese Meal, Choline Chloride, Vitamin A supplement, D-activated animal sterol (source of Vitamin D3), Vitamin E Supplement, Taurine, Copper Proteintate, Zinc Proteintate, Manganese Proteintate, Ferrous Sulfate, Manganese Sulfate, Zinc Sulfate, Niacin, Calcium Pantothenate, Cobalt, Copper Sulfate, Riboflavin Supplement, Calcium Iodate, Thiamine Mononitrate (Vitamin B1), Pyridoxine Hydrochloride (Vitamin B6), Biotin, Folic Acid,Selenium Yeast, Sodium Selenite, Vitamin B12 Supplement, L-Ascorbyl -2- Poly Phosphate, Di-methionine.