
Ah but there is no cruelty involved with docking a pup of two or 3 days of age, and certainly the vet does not give an anaesthetic either.
Puppies are born with very immature nervous systems. I have watched a video of a Boxer litter being banded and the pups and mother were totally unconcerned, taking them to the vet is far more likely to cause them and their Mum upset that the docking.
Lambs are born with fully developed nervous systems and are docked with no anaesthetic and are also castrated by banding (an elastic band around the testicles), and this latter does cause some to go into partial shock.