5. Bullmastiff
It is only natural to be intimidated by the bullmastiff’s large stature. After all, they can reach up to 130 pounds. That’s why it is imperative to train a bullmastiff well to have its obedience. This breed is generally employed as guard dogs because of their temperamental behavior. So, if you need to keep your safe safely guarded, you should consider owning a bullmastiff.