Most of our
dog breeds have some form of aggression in them, since they needed different forms of aggression to do their work: terriers are often aggressive towards other
dogs and animals — they were and are fighters, the man working
dogs imprint humans
as being of their same species so they show the same kind of aggression that they show towards other
dogs, the sight
hounds were bred to be killers of game and sometimes other canines, the mastiffs were bred to take down
large game and guard property, the flock guards were bred to be aggressive towards canines, the
hounds were bred to be aggressive towards furred animals, some of the pointers were bred to be able to guard the hunter's game, etc., etc..