The breeder I got Reeses from had theirs docked so Reeses has a docked tail. I havent ever seen a yorkie with a long tail but that doesnt make her a freak. If the breeder doesnt automatically have it done, then its just personal preference the way I see it...but...I wouldnt dock it once you get the dog b/c I would think the older the pup is the more it would hurt unless vets can still do it in a different way. Cause when they are newborns the docking procedure just consists of taking a tail dock which looks like big dog nail clippers and they just chop it off and stitch the end up. No gas or nothin. Which seems painful but supposedly they cant feel it bein that young.
I wouldnt worry about it tho...Im sure your baby is precious either way!!