I don't know if you have gotten the allergy thing figured out or not, but I know most yorkies cannot eat anything with yellow corn in it. They get canine seberia?? ssp I had the same problem with my yorkies years ago and someone told me about the corn problem and so I tried a dog food without corn and so far it has worked. Now I check the ingredients and if it says yellow corn I put it back on the shelf. SO FAR SO GOOD.
Donna & her furbabies