An Orthadontic band is placed at the end of the puppies tail at 24-96 hours old . this cuts off the blood supply to the end of the tail , which comes away within 3 days.
There are two opinions on how to do this. The first is, that if you feel it must be done, take it to the vet at a really early age before the nerves are developed or don't do it at all.
THe second...