Friend had a nasty pit-bull mix that she rescued. She could not trust the dog off-leash and could barely control her on-leash. Her other dog was a loud, pushy husky mix and the two dogs would regularly get in fights that would last until the husky pinned the pit. If the husky hadn’t been several inches taller and at least 40 lbs heavier the pit bull probably would have killed her, but instead they had an uneasy balance that would occasionally tip into a fight. The pit bull was a sweetheart most of the time but then would occasionally explode. I did not like visiting her house when she had those dogs.
A coworker had an Akita that regularly killed small animals including the neighbors’ cats and, if I recall, another neighbor’s dog, and always watched people like it was stalking us. She had excuses for why it was always the other animal’s fault when her dog killed something. Glad I was not her neighbor.