My husband thinks the neighbor has something to do with it. We can tell they hate that we got our GSD and all the sudden they are throwing gum in our yard so that she would eat it and die. He thinks maybe they sprinkle black gun powder out there or shakes a can of pennies or blows a whistle to agitate her. I don't know, but I'd like to find out what is setting her off to do this. There is absolutely no warning before she does this.