First, wrong. When removing dews, the "toe" is clamped off then cut off with an instrument similar to scissors. If the pups felt no pain, then why in the hell do they scream bloody murder? Same for the tails?days old because there are
no nerve endings there yet
By the time a pup is born, the body & everything within it is fully formed & ready to function on the outside world.....including the nervous system.