I know this topic has been covered before, but I haven't got answers on what works so I'll ask again. I have (or had) a small flock of 5 hens. Had two dogs, a pure Rottie and lab pit mix, last summer added another pit rescue to the mix. The new dog has taken to chickens in a bad way, worked through the fenced run (literally through the fence) and chases them around. Never harmful until recently. In the last month she has killed two of my hens. Just recently got another clutch of pullets so I'm quite concerned, though they are currently safe in a cage in the barn I'm worried about putting them into the outside world. I Will be greatly reinforcing the fenced run using goat fence instead of poultry net around it. I still want to free range them though (at least when I'm home), so has anyone had luck with shock collars to train dogs away from chickens? For what it's worth my Wife witnessed the second attack and the lab mix, which is trained as a bird hunting dog, chased off the attacking dog and guarded the injured hen until she expired. He has taken the role as protector of the flock and has killed two opossums that have tried to get into the coop. Somehow he knows our birds are friends, just not sure how to instill that knowledge into the new dog. Any help would be greatly appreciated.