The only thing that I can contribute to this discussion is that I would urge you to switch to a grain free dog food if you haven’t already. At one point when I was feeding my dogs kibble they all had yeasty ears and tear stains, as soon as I switched to grain free (a couple of weeks or so) all that disappeared. I now feed raw for other reasons which is all grain free and no yeast issues, no tear staining, no gas, bad breath, itchiness, etc. etc. Try a 3 – 5 star reviewed grain free food and then go from there. It may be that your dog is having issues with only grain, or grain and some other ingredient in a food you are feeding. Typically it’s grains. Dogs were not meant to eat grains nor do grains have any benefit for dogs.
