mmm, think that is a little bit of a big claim to make, i appreciate all kinds of running dogs, but theres some work, pre ban, that the bull x was bred for,ie fox,with the drive, stamina, tenacity, pain threshold,thats bred into the well bred,tested dogs/lines etc. The x you mentioned would very much struggle with that type of heavy work load, but then the bull x dog could be lamping bunnys the next night after foxing,very versatile x the bull x's,not knocking the other x's, just my opinion, .