Well, you all know me and what I say when it comes to scumbag neighbor dogs or strays coming on my property and killing my flock, and if you don't it's worth repeating:A
At that point you know he is a danger to you and your family. Not only are you protecting your flock by dealing with that animal(shooting or calling animal control) you are protecting your family and others. I'd be calling before the dog was released again, tell them the dog has attacked you and your family.
S - S - S
Shoot - Shovel - Shut Up
Sorry if this offends anyone, but that's just the way it is with me. I'm not going to play "nice" when I've put all the blood, sweat, and tears into my little flock. They are not just chickens...they are my friends...and friends don't let friends get ripped to shreds because some jackass has decided to let their dog(s) roam wherever they wish....
(Off my soapbox...for now)