Hey, My Yorkie has the ichies, and I bath him in a shampoo by Redken that is for dandrif, it is thier Scalf Relief type,,a good salon will carry it. Don't get it in your yorkies eyes, let it sit on the skin for 60 seconds or so, it really works to sothe,,I have not had problem in years, and he is on no special diet for itchy skin. He is on the pill type flea, tick and heartworm med.
Hope this helps,,,,