This Breed was bred out to enable a stable cooperative nature in a pack. However, in areas where dog fighting continues, the Bully has been used for fighting due to its great stamina, fighting skills, fearless nature and power.It was used for Guarding Sheep Flock and used as a Guard dog, some times this wonderful breed is used in dog fighting in Pakistan which is now a banned sport, recently this breed is imported in China, Russia, UK, USA and Central Asia . 
^IIes, Greg (2009). The Devil’s Punchbook. New York, New York: Simon and Schuster. p. 279. ISBN0743292510. A Chinese billionaire’s son brought his own dog in to fight. A Bully Kutta. Ever hear of those? Bastard weighed more than I do. The dog, I mean.