The Bullmastiff is very protective and possesses fearlessness and readiness to accept any challenge. There are many theories of this breed, but research, findings, and history of the mastiff have it crossed between an English mastiff and the bulldog. England however, developed this dog extensively for dogfighting Throughout Europe and many parts of the world the mastiff was used for guarding livestock, estates, and in war. Currently, the mastiff is being used in guarding African diamond mines and guard work in the military.