Both of my yorkies have modified silk and I use Petzlife Cranberry Fields shampoo and conditioner. I've tried MANY shampoos, mostly on the cheaper side since I'm on a budget, but the Cranberry Fields shampoo and conditioner has done wonders for their skin and coat. It's great. I will never use anything else. The best part about it is the PRICE!!!!!!!!! Kathryn V sells it at
www.beyondspoiled.com.