wow... that has ot be so frustrating for all concerned!! I am sorry you have to go thru this,,, I wish I could offer a cure for it,, but I am at a bit of a loss... all dogs seem to be looking for trouble and thats one VERY hard thing to break,, esp if the neighbours arent helping! Can you put up some wire fencing along the inside of the fence on your side? it wouldnt be attractive and all,, but it might help? Like burying the wire up to say a foot or so deep intoi the ground?? I know that chicken wire is a big turn off to dogs as it bothers thier feet to touch,, wont help the jumping tho.....