Boxer
Boxers have imposing looks with their large heads and muscular bodies. And this is probably what scares most potential dog owners.
They have a loud and powerful bark coming from their inherent watchdog abilities.
It can be said that any dog can be aggressive. But with proper socializing, the boxer can be a great family protector.
But, they need a lot of attention and at least one to two hours of intense activity per day.
Boxers from German lines are more forceful and can be a real challenge unless you are an experienced dog owner with some training experiences.