- Flock Mistress
Chicken-killing dogs are tough to tolerate when you are keeping poultry. I've been incredibly lucky so far- 5 dogs and only the last one has shown signs of nefarious intentions towards the birds. Fortunately, she is also so devoted to her people that she is easily deterred with a sharp word. I would never trust her alone with the birds, though, which up to this point I have been able to do with all our other dogs.
Maybe you start putting some hot wire around the coop/run? My youngest dog got the surprise of a lifetime when she hit the hot wires around my coop/run. She has never even looked at the birds while they were in the run again. She may still make a try for them if they are outside, but never near the fence.