Actually, I believe if a Yorkie tail is docked, it is supposed to be docked at a 'mid' length...not a nub. Plenty of Yorkies have their tails docked too short...like Mia's, which is basically a nub. The long hair on Mia's nubby tail makes it look better IMHO...and it jiggles so cute when she wags.
Brody's full tail waves like a flag in a high wind, and is just so cute, too.