How do you cut off Doberman tail?

Dobermans' tails are traditionally docked, or cut short, within a couple days of birth. This tradition dates back to medieval Europe, during which time dog ownership was taxed unless the dog was a working dog. Dogs were identified as "working dogs" (guard dogs, herding dogs, etc) by having their tails docked.

This is done by a veterinarian, who uses a very sharp scalpel to cut between the vertebrae of the tail at the correct length, then uses tissue glue to seal the skin back together. The puppy must be less than 5 days old for this to be done - any older and the risk of unintended side effects goes up.