ok I can't resist I do have to laugh at that one. I have never heard that one before. I would never do it either but I reckon there are people who would. There used to be the old technique of biting your child back to break them of the habit and I guess it goes along the same lines. but I never believed in that method either.
I wouldn't suggest you bite your yorkie. they soon get over the biting habit with some stern no's or loud ouchs. Believe me if I can break Ahia of her bad habit of biting anyone can do it. she was really bad about it.