One of our shih tzus had hot spots when I switched her vit. supplement. Had to go back to a seafood greens powder to stop it. Our dogs are on raw food with dehydrated veggies and no grains. They do not get bones as they get too "loose" with them.
I use a frozen raw food and hydrate the veggies in the fridge after each meal for the next meal. Both Whole Earth and Paws for a Moment carry a variety of both raw and dehydrated foods.
From what I know about grains, I think that a grain free diet works best for dogs with any digestive challenges, which show up as skin issues. And I think the little dogs have more of a challenge with digestion issues than large dogs who seem to be able to handle just about any diet.
Good luck on with your sleuthing. I know how distressing it is when one of our "kids" has a challenge. There are lots of resources out there and good info. You just have to go with what you feel is right for your dog.
LW888
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"A journey of a thousand miles begins with a single step" Lao-tzu
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