I found out the neighbors had put up a wire fence inside their yard so the dogs couldn't reach our fence....that is why we hadn't had problems in a long time (my dogs could still reach the fence...but they don't try to go under unless their dogs are trying to get through). But they recently decided to take it down thinking that the new dog would distract the boxer from trying to get over here. Yeah clearly that worked, they said they are going to put it back up, I sure hope so. I would have put up chicken wire a long time ago but its my parents fence and they don't want that, ugh. Once I get my own house I will create a super fence haha that can't be broken or dug under. I need it for peace of mind.