When do you dock a boxers tail?
You should have your Veterinarian dock the tail within 3-5 days of birth, no later. I hope you are not planning on doing it yourself as would be extremely painful for the dog and could get infected.
It is against the law to dock a dog's tail in Australia and the UK. If you do dock a dog's tail in Aussie or UK you can face fines up to $37,500. However in the UK dogs that are classed as "working dogs" at the moment can have their tails docked by a vet - however you must prove the puppy is a working dog.