We make sure that all of our dogs know that hands are not for playing...they are for loves only. I've seen on some shows and whatnot that people tend to play with their dogs with their hands and it some times caused confusion. We were forced into giving this a try with our mastiff when he was a puppy and it has worked for him so far....and he's 5yrs....it has also worked with my grandma's Jack Russel. I would assume it would work the same with a Yorkie. Try to make sure play is with toys and love is with hands. Hope that helped some.