We had one episode and he killed one and injured another a few days ago. So we put 2 strands of barbed wire around the bottom hoping it would deter him. He got in again tonight...luckily I was outside and heard the mayhem and got there in time to save the two he got...hopefully they will be okay, no visible wounds. What do I do to keep him out without getting rid of him? We are thinking of putting invisible fence around the run, but that could get pricy...he is a stubborn Jack Russell that I love dearly-we have had him ten years...BUT I AM MAD AT HIM RIGHT NOW! I know you all are going to say to choose between the chickens and the dog, but I really don't want to have to do that....please help!!!