Im with Loe on this one.

I would want a docked boxer, first and fore most for the welfare of the dog, i.e. boxer, aggressive wag + thick and strong tail = plenty of damage and stress on the dog. surgery etc.

Also for the standard of the breed. Boxer with tails in America are penalized heavily at shows. Yes breeders do it more for the cosmetic reasons but me personally I'm thinking of the future of the dog.