We had a German Shepard back in the the early 70”s.
Very protective of his house, even more so with my mother.
She went to the front door, it was girl Scouts selling cookies.
One of the Girl Scouts tried to force her way through the front door.
The dog had a different idea.
He pinned the Girl Scout down on the front porch.
He didn’t bite her, but he had those teeth right in her face.
When the girl scouts came to our door my Beagle Buddy jumped the one holding the cookies and held her down til she gave him one. :)