I was once walking down a street in Leucadia, CA one evening and a pit bull charged me from the bed of a pick up truck. I admit, it scared the hell out of me. It stopped at the end of its chain but I know damned well the thing would have mauled me. The moron owner laughed and said she was “harmless.” I told the dolt that if I had had my sidearm on me it would have been dead. He didn’t think that was too funny.
Bingo. These dogs are bred to mindlessly attack, not protect. If you want a guard dog, shell out the cash to a reputable German Shepard breeder and pay for some training. Pit bulls offer just as reliable “protection” as a shot-gun trap or a land mine.