While it is illegal (and unethical) to shoot them, it's also the owners responsibility to keep them safely fenced. And if he makes no attempt to do so he can be held liable for any damages.
Since you've already broken rule #1 (putting it on the interwebs) I would pay a small fee to have a lawyer send him a polite letter.


My opinions and comments are my own. They do not reflect the position or political opinions of Aldeer or any of the Aldeer administration.