Okay, I am playing devil's advocate here, and I don't mean to be offensive.
One issue is of course, the irresponsible neighbor letting the dog run loose. They need to be taught that it is NOT acceptable, ever. I like the certified letter idea, so your documentation is clear.
But this is the third attack, and you don't have the chickens fenced in, protected from predators somehow? After my second attack I told my chickens sorry, no more free ranging until the electric fence goes up.
Good luck, this is the kind of thing that starts ugly feuds, I hope it can be resolved!
One issue is of course, the irresponsible neighbor letting the dog run loose. They need to be taught that it is NOT acceptable, ever. I like the certified letter idea, so your documentation is clear.
But this is the third attack, and you don't have the chickens fenced in, protected from predators somehow? After my second attack I told my chickens sorry, no more free ranging until the electric fence goes up.
Good luck, this is the kind of thing that starts ugly feuds, I hope it can be resolved!