Training a catch dog

It's not really much into training a bulldog. They either catch or they don't. All you need to do is start turning him loose to bays right behind another bulldog going in and they usually pick up pretty quick. As far as the getting shoulder to shoulder I don't think that can be taught some dogs get cut everytime they catch something with teeth and some never hardly get cut. But I would think the more big hogs he catches and handles the better he will get just gives him more experience everytime he catches