That Pyrenees is no pet. It is a working dog and it did its job fabulously. There are several fierce breeds of guard dogs. I cringe when I see them kept as pets.
I have an Anatolian Shepherd/Ahkbash mix who is 18 months old. While he is a stubborn son of a bitch literally he is very socialized. He is 130# of steel and guards his acreage well. If there were enough stupid coyotes here dumb enough to try and take him on his property, I would want to be there to kill the rest. He would then get to eat them and would save me on dog food. His biggest issue with people is he doesn’t know how strong he is. Loves women and children.