They are bred as weapons, trained as weapons, and should be treated as weapons.
They haven't been "bred as weapons" since the 1800s, and such fighting traits are hard to maintain. Breeding is not evolution and the instincts don't go as deep. Bulldogs were also bred for baiting bulls as well as fighting...
"Over the centuries, dogs used for bull-baiting developed the stocky bodies and massive heads and jaws that typify the breed as well as a ferocious and savage temperament.In England, the passage of the Cruelty to Animals Act 1835 caused a decline of bull-baiting and dog fighting, leading to a lack of interest in perpetuating the Old English Bulldog."...but no one assumes modern bulldogs are vicious killers.
