That is a horrible thing. I would write all this in a letter and give it to them...explaining the harm their dog has done to your family since talking does not appear to work.
Then I would buy some cheap wire fence and put it up between the posts for now. If you can keep your kids away maybe they would get the message with barbed wire or electric fence ..........
NAPWDA Certified Cadaver Dog
Waiting at the Bridge (italics
=GSDs) (hemangiosarcoma=blue):Grim , Cyra, Toby
, Rainbow, Linus, Oscar
, Arlo & Waggles