collie cross will be a better pot filling dog than most on average with the right collie blood they have it all, my saluki type thing i have now is no where near as good at the same age as mooching picking game up, marking, ferreting etc He is however a lot quicker and has lot's of stamina to go with it. Never had any experience of bull blood though.. For an all round coney dog/pot filler i think the collie lurcher will on AVERAGE be the best but like it's said good and bad in all breeds?