I have a neighbor with one of those. He follows my yard movements and attacks the chain link fence whenever I approach to weed or cut grass. When the owner moved in he put a 5-foot wire fence up against the chain link fence to keep him and the female pit in the yard. Except for food, water and cleanup of poop every few days the dogs have no human interaction. The male pit takes out his energy and frustration on garden tools and the water hose.