Trainers tap into the dog's natural dominance and drive to defend its territory when raising an English Mastiff for thefighting ring, but this breed is normally very calm and makes a great pet when raised properly. 15. Dogo Argentino We expected another mean and scary-looking popular fighting ...
but have been called thatdue to similarities in size. These dogs are energetic, intelligent, and independent, which can be a tricky combination for trainers to work with, but rewarding with the right amount of patience.