Smudger is the only yorkie irl that I have seen with a docked tail, as Alona said it is seen as unethical over here and is actually illegal. But Smudger does have his tail docked I think it looks really cute and nice and neat. But I don't dislike a yorkie with a tail, but they do worry me for health reasons.
My mums yorkie is 7 and she has her tail and it has a big (and I mean BIG) lump in her tail, my mum said it's where she trapped it badly in the door..... although I'm not convinced