There was another chicken death in the backyard. This time we caught the dog in the act. It's a bad dog, a very bad dog. We called the sheriff's office this time because, well, three strikes and you're out.
Things we learned:
Where the dog lives.
That we can legally shoot the dog if it's on our property.
They will haul it off to the pound if we can grab it.
I reinforced the fence and clipped the hens' wings again so they can't fly out. I don't really want to shoot somebody's dog. It's not the dog's fault. Anyway I don't have a gun. So we'll continue our strategy of crossing fingers and hoping for the best.