I was told by a reputable bewier breeder. that has line's from Germany That Mr. Bewier used Sht Tsu in his breeding practice when he started to breed the bewier. I was gonna buy one of these beautiful dog's. but on that info I changed my mind and got a regular standard yorkie. I think all Yorkies are beautifulo no matter what color. I just hope the breeder's are breeding to better the breed.