My German shepherd mix pups killed 7 of mine over months. Ringo got three one afternoon when he got under the back fence. We fixed the fencing and the dogs, a year old now, are not allowed out front off leash. We are working with them on chasing chickens. They never drew blood, just think of them as toys to play with. Ringo got whacked over the head with the rooster he killed so hope that helped because only time he has been hit. (I was very angry) Their mom has no problem with chickens after we told her no when she met them. She was dumped and pregnant so we kept three pups. We love them and would not give them up for killing some chickens but are working toward them eventually being good with leaving them alone. I think dogs are too smart to be passed around when they are bonded to you. The mom is still anxious when I am not around since being dumped, even after over a year with us.