I cannot imagine what that costs per year in dogfood. But would get a stranger's attention. Growing up we had a Lab mix that was given away in the local paper. They had it in the backyard attached to a closeline wire. When a stranger would approach our house (we had 15 acres) he would bark once or twice and then lay there and growl. I swear you could hear him for twenty yards. Smart strangers would start shouting to get someone's attention. He also loved to retrive box turtles.
not a breed for the faint of heart!