Dogo Argentino
This Argentinian breed is tough and has also been banned from being kept as a pet in many countries because of their aggressive nature. Even if they’re trained, they’ve been known to attack humans or other dogs without warning.
Rhodesian Ridgeback
These dogs have been used for tracking lions in southern Africa, which should tell you that it wouldn’t be a good idea to keep them as pets. They have been known to jump fences and attack children if they feel threatened.