Hi, and welcome to YorkieTalk, how nice of you to try to find a special product for one of your clients. I just took Joey to his breeder to be groomed and she used a product on him that I have never heard of before, it's called Ring 5/Gerard-Pellham Whispering Mist. This is a spray on conditioner, and I couldn't believe the difference it made. The broken hairs seemed to mend themselves, and he looked ready for the show ring when she was finished. She said that the trick was to shake the bottle thoroughly and spay once on each side, otherwise it would look oily. She's a show breeder, and I believe that she's tried many of the products out there, so when she recommends something, I listen. It smells really good too. Here's a link:
Ring 5/Gerard-Pellham Whispering Mist 8 Oz