Sorry for the diarrhea of post but I really loved and miss our Mal.
On the protection side at our current house we have a wrought iron fence he would patrol the fence line and make lap after lap. He’d chase bikers, joggers, kids up and down the fence. Luckily it was a ways off the street and he couldn’t get to anyone. Like LJ mentioned he was super cool with people if we let them in the house. We had one party with probably a 5 year old kid climbing all over him pulling his lips and he just laid there.
He was also super small animal aggressive no real problems with dogs but everything else was fair game. We found several dead cats in the back yard over the years. Right after I got him he caught a cat in the yard and proceeded to throw it in the air, watch it hit the ground, pick it up and throw it again until it was dead. I buried it and he dug it up the next day and was throwing it around again.