Your yorkie's story sounds just like my Jaya. We tried everything and she still itched and scratched for years. Finally found Dermacton spray and soap. Her skin is 100% better and her coat came back. You can find it on
Aromesse Natural Animal Healthcare Products for Dogs, Cats and Horses. I hope you get the same results. It's just wonderful when they stop scratching. I'd like to hear how your Yorkie gets along.