I agree with Dee.. If you have Biewers you do NOT dock the tails. Please talk with your breeder about mentoring you on the Biewer breed. If your breeder does not offer to help you, there are breeders or Biewer owners/Lovers on this forum or other Biewer - specific forums that would be more than happy to help you out.
Biewers are rather new to the US and they are a wonderful, exciting breed and in some ways they are different than the Yorkie. It may be a good idea for you to do some reading on the breed so you can fully appreciate your good fortune.
-Diana