Selina, clearly there is a ban on barbed wire fences -- I believe it is quite similar to the ban already in place for assault weapons. You must don your most black attire and go out in the darkest of night with some good gloves and wire cutters and cut a nice big hole in their fence. Then you must leave a trail of kitty treats leading up to the hole you have so clandestinely cut into the fence so that other furry creatures may enjoy your neighbor's garden as well. So it is written and so it shall be done!