I agree with whomever said violence doesn't solve problems. I had a stray dog come into the rabbitry and chew off a rabbit's leg through the wire. One of my mother's wonderful family dog, Springer Spaniels killed one of my show rabbits and was parading around with the dead carcass. My Pit killed one of my hens, and broke the leg on another. At no time did "kill the dog" even BEGIN to enter my mind. I cannot imagine that.
Heck, last winter we had a fox come in the barn and kill a chicken, and injure several more, and I tried for 3 days to find a wildlife rehabber to take him. He was terminally mangey and my husband shot him. To this day it haunts me to see that little fox sitting there and get popped in the head with a .22 shell. I just wish he could have gone to a rehabber, gotten medicated, and been released into the wild. He came into my barn because he was freezing, and starving. I actually let him have a last meal of all my chicken eggs. I locked my hens up, and gave him eggs, cat food, and water, while I tried to find someone to take him. When everyone said NO, I decided hubby had to shoot him. I didn't have the knowledge or skills to treat him, and I couldn't leave him locked up in my chicken pen.
These are ANIMALS. If we establish a food chain in our back yard, ocassionally animals WILL act on their impulses and a predator will pick off a prey. It is unfair and unreasonable to kill any predator who acts on instinct and takes prey down.
HUMANS prey on the weak and defenseless for sport too!! It is a multi million dollar industry. We have NO reason to go out into the woods and try our level darndest to outsmart wildlife just so we can shoot them and hang their dead carcass on the wall, BUT WE DO IT.
I don't care if a dog has been bred for generations to be a "stock dog." IT'S A DOG. It was a predator for thousands of years before it was a Labrador or a Blue Heeler.
I caught my dog in the act of attacking a cat, and I knocked him down on his back and pinned him to the ground by his throat and made him think I was going to murder him right on the spot. He totally got the message, and has NEVER pounced on another animal since. That was 3 years ago. The cats now rub all over him, and lay between his legs. He gives the chickens a wide berth and doesn't even offer to look in their direction.
Would I turn him loose in the barnyard with a flock of chickens and kittens, and trust him for 3 days with no supervision? NO. But his little come to jesus meeting made him believe that the alpha dog on this farm would skin him alive if he dared harm another animal.
It amazes me that want to kill an animal (even a family pet or working farm dog) for acting on their instinct, but if a kid does something stupid, we slap it on the wrist and tell it to go to its room. Why not shoot the kid and throw them out with the trash for screwing up?! SARCASM here, but you see what I mean.
Violence does not fix anything. Protect your chickens, take reasonable steps to reform the dog, or keep him locked up. But death is not the answer to all of life's problems. You kill one dog, and next thing you know there is a skunk chewing heads off. When you have chickens, that kind of crap just happens unfortunately.
Yes certainly if a dog is a persistant problem, the owners refuse to control it, it is a multi-time offender, this problem is ruining your life and costing you major losses, then you may need to dispatch. At that point, the dog is probably beyond reform, and he's got to be miserable running the streets anyway. But a randon, one-time event, no.