I can't answer your legal questions, but I have an idea that might help.

I've heard that some people get rolls of this plastic stuff and weave it through the holes in the chain link. Perhaps this would deter the kid from sticking his fingers through the fence and maybe if Lacey couldn't see him outside, she wouldn't run up to the fence. One lady on another board I check out did this on one side of her yard because she had kids sticking things through the fence and teasing her dog. She said it has worked like a charm and cost her around $120.

Good luck and hugs to your sweet Lacey!