I don't think yorkies have sensitive tummies (overall), but I'm not sure what's wrong with your cutie. Have you switched food or added any new treats? Could he have gotten into anything? How are his poos (that's usually a great clue)?
What are you feeding?
__________________ ~ A friend told me I was delusional. I nearly fell off my unicorn. ~ °¨¨¨°ºOº°¨¨¨° Ann | Pfeiffer | Marcel Verdel Purcell | Wylie | Artie °¨¨¨°ºOº°¨¨¨° |