http://www.petfooddirect.com/Product/9271/Halo-Spots-Stew-Wholesome-Chicken-Adult-Dry-Dog-FoodHalo Spot's Stew Wholesome Chicken Adult Dry Dog Food
Chicken, whole dry egg, pea protein, oats, vegetable broth, pearled barley, chicken fat (preserved with mixed tocopherols and citric acid), pea flour, chicken liver, wild salmon, flaxseed, salmon oil (preserved with mixed tocopherols), pea fiber, sweet potatoes, apples, blueberries, green beans, carrots, cranberries, zucchini, alfalfa, inulin, calcium sulfate, potassium chloride, salt, taurine, folic acid, zinc proteinate, iron proteinate, cobalt proteinate, copper proteinate, manganese proteinate, vitamin A supplement, vitamin D3 supplement, vitamin E supplement, choline bitartrate, niacin, pantothenic acid, ascorbic acid, riboflavin supplement, thiamine mononitrate, pyridoxine hydrochloride, biotin, calcium iodate, lactobacillus acidophilus, bifidobacterium longum, enterococcus faecium, lactobacillus plantarum, sodium selenite
Halo Spot's Stew Wild Salmon Adult Dry Dog Food
Salmon, whole dry egg, pea protein, oats, vegetable broth, pearled barley, chicken fat (preserved with mixed tocopherols and citric acid), pea flour, chicken liver, whole salmon, flaxseed, salmon oil (preserved with mixed tocopherols), pea fiber, sweet potatoes, apples, blueberries, green beans, carrots, cranberries, zucchini, alfalfa, inulin, calcium sulfate, potassium chloride, taurine, salt, folic acid, zinc proteinate, iron proteinate, cobalt proteinate, copper proteinate, manganese proteinate, vitamin A supplement, vitamin D3 supplement, vitamin E supplement, choline bitartrate, niacin, pantothenic acid, ascorbic acid, riboflavin supplement, thiamine mononitrate, pyridoxine hydrochloride, lactobacillus acidophilus, bifidobacterium longum, enterococcus faecium, lactobacillus plantarum, calcium iodate, biotin, sodium selenite
No one seems to be helping us get much further here as to odor producing ingredient. So at least here's the possibilities. Rotten meat, eggs, fats, veggies and/or fruits all seem to have the potential.