Have any countries banned tail docking?
Yes, there are countries, which have banned cosmetic tail docking for a considerable number of years; Norway since 1987 and Sweden and Switzerland since 1988. Since 1991, Cyprus, Greece and Luxembourg have also introduced a ban. Tail docking has been banned in Finland since 1996 and Germany since May 1998. Political pressure was exerted in Germany to have hunting breeds exempted, however exempted puppies must be the offspring of parents that were specifically used as hunting dogs, not just hunting breeds. In spite of many claims to the contrary, there is no proof that an increase in tail injuries or serious health problems occurred as a result of the ban on tail docking in these countries.
In England, since July 1993, only registered veterinarians can perform tail docking. The Royal College of Veterinary Surgeons has declared that the docking of tails, other than for therapeutic or prophylactic reasons, was unethical. The RCVS stated in 1996, that such docking is capable of amounting to conduct disgraceful in a professional respect, and described such docking as unacceptable mutilation.
In Australia, one State, the Australian Capitol Territory has banned tail docking. It is hoped that other States will follow this example.
http://www.wsava.org/Taildock.htm
It is the YTCA that sets the standards for the Yorkshire Terrier and it is the recognized club of AKC. This means YTCA says No to tail docking and not AKC.