@berdie I fostered a poodle for a time once. Very smart dog and would run with the big guys like she was one of them. Very funny to watch. I have a good friend who is a groomer/trainer/breeder (Catahoula) that assured me the standards are the best guard dog one could have. I never had one wander up, so I guess I'll believe her. Most of mine looked imposing but would probably just lick an intruder to death.
Don't believe that for a minute. Chances are they have just never been in a position where you were at danger or risk of attack.
Several years ago I had to call the rescue squad to come to my house to take me to the ER. I also called my ex,told her what was going on,and asked her to feed my cats while I was in the hospital.
The ex and her sister got here before the rescue squad that is MAYBE a half-mile away,and witnessed that little black and white female "Sylvester cat" jump up on the arm of the couch I was sitting in,hump up her back,and snarling at the rescue squad in an effort to "protect" me. I had to pick her up and pet her to calm her down,and then put her in a travel cage to make sure nobody hurt her while the rescue squad was taking me out. My ex,of course,let her out of the travel cage after we were gone.
This little "short hair dwarf cat" that probably doesn't weigh 5 lbs was found trying to hide in the tall grass around my yard after someone abandoned her on this island. I spotted her when I came home from the grocery store one day. She was so tame that while she did hunker-down and appear to be trying to hide,she let me pick her up and take her inside the house. Once I sat her down on the floor,she took a look around,discovered she was inside a house again,and immediately made herself at home.
A few months later I found another abandoned "Sylvester Cat" in my yard when I came home. This one is a male that was maybe 1 or 2 lbs heavier than the female,but with the same "I wanna eat and take a nap" personality,and long hair. Both are VERY affectionate and like to be petted and handled. The male was trying to lay down on my shoulder to take a nap earlier today.
MAYBE cats don't do this sort of thing often,but some do sometimes.