Here is a list of ingredients in his food?
Duck meal, brown rice, whole barley, ground rice, soy protein concentrate, rice bran, whole oats, chicken fat (preserved with mixed tocopherols and citric acid), dried beet pulp, sunflower oil (preserved with mixed tocopherols and citric acid), flaxseed meal, lecithin, chicken flavor, salt, dicalcium phosphate, potassium chloride, dried corn syrup, DL-methionine, L-lysine, yeast extract, dried cranberries, dried apples, dried blueberries, dried carrots, chicory root extract, dehydrated spinach, tomato powder, parsley, dried honey, mint leaves, dehydrated green tea, dehydrated alfalfa meal, choline chloride, glucosamine sulfate (0.04%), chondroitin sulfate (0.01%), yucca schidigera extract, ascorbic acid (vitamin C), dried rosemary, dried thyme, dried oregano, dried fenugreek, dried fennel, dried cayenne, dried ginger, iron proteinate, ferrous sulfate, zinc methionine complex, zinc oxide, sodium selenite, vitamin E supplement, vitamin B12 supplement, copper proteinate, copper sulfate, manganese proteinate, manganous oxide, folic acid, niacin, calcium pantothenate, vitamin A acetate, riboflavin, pyridoxine hydrochloride, thiamine mononitrate, biotin, menadione sodium bisulfite complex (source of vitamin K activity), calcium iodate, vitamin D3 supplement
Anything there that sounds like it might give him bad breath???
He seems to be eating fine so I dont think its a tooth but it smells kinda like that so I will check!
Thanks
Carole