My ninety five pound shepard mix definitely would. She can sense in an instant if we are uncomfortable with a visitor or anyone at the door.
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And he lives in my gunroom.
And don't **** with his 12 gauge.
Team Mastiff here myself....he's as gentle as can be with us. but when my wife and child are home alone he's a vicious hellbeast especial paired with my German/Australian shepherd mix.
I do end up cleaning a lot of slobber off of the walls, furniture and even the ceiling.

"I was raised around pit bulls my whole life, it's ok". .
Good thing it's a Boxer, huh?
You are preaching to the choir brother.