Fighters?
Mastiffs, with their gentle natures, do not have the instincts that dogfighters are looking for. Their protective instincts make them actually the opposite to the aggressive fighting personality. However, they will, at times, fight among themselves, or with other dogs, for the typical canine reasons such as pack dominance and sexual competition. Two 190 pound adult male Mastiffs in combat for pack leadership can be next to impossible, as well as exceedingly dangerous, to separate. d.