I have one for my cocker and we used it on our min pin when he was alive. LOVED it for them...I did use it on maggie once but I am not sure if I liked it for her or not. I don't think it "hurt" to use it on her...but I don't know that it did any good either. It seems to me like it would cause breakage on the yorkies hair since their hair is usually so fine...but that is just my thought on it..not my experience