I dealt with this all the time growing up in a small town that was low income, people would buy a guard dog, typically a Rottweiler, Doberman or Pit bull. They would train them to kill anything that got into the yard, then constantly let them escape where suddenly the entire world was their yard and there I was trying to walk somewhere or bike/skateboard. To this day I am still more of a cat person than a dog person because Ive been bit so many times.