The first time I knew we had a problem was on a cold day in March when he had gotten out of his pen and chased a chicken until it was so worn out that it sat down in the snow and basically froze to death. I found this unfortunate hen and moved her to a warm location, but it was just too late for her. I really knew that we had a problem after I chased him around our property trying to get him away from another hen and after securing Mr. Bunker found more carnage behind the wood pile.
Bunker never tore into the chickens or tried to eat them, he just joyously chased them and then "played" with them until their unfortunate passing.
I attempted to add height to the fence to keep him in his area and he managed to find ways around that so the poor guy ended up being sequestered to the fenced in area on a leash. I gave him extra slack on the leash, but this was a mistake because he would jump over the fence and then stand on the opposite side still attached to his leash.
Thankfully, some friends of ours were able to help us find him a good home. This new home is a family with children and two other dogs, and most importantly no chickens!