I can only go off what I have seen and that was Nipper the sire of Blue. It depends what you mean by quitters. I have seen Nipper turn off rabbits at night that he could have caught. Was he plain lazy? was he conserving his energy, maybe he knew he was going to have a long night (he usually did). During the day it got to the stage where he refused to jump, but he could jump 5 bar gates with ease.
Nipper was a very complicated dog if he had not been in the hands of Victor I am sure he would not have been the same animal. When lamping He was never on a lead and Victor could stop him cha