I have 3 hens and when I got the third one it was the Black English Orpington, every since my 2 year old boxer/shepard mix will not leave her alone, only her he ignores the other two. 2 of my hens got out of their run from a hole under the deck (it has been fixed) and my dog went after my black hen, tried to carry her and she is big but held her down and plucked out her feathers on her back. I treated her and put a saddle on to protect her from him and the other hens. Yesterday, she decided she wanted to run the back yard so she and she alone got out and i found my dog, again, holding her down and plucking out the feathers much worse this time. Why does she not run or even make a noise, she just sits there and does not fight back. Why does he only go after her? She seems fine, eating drinking playing scratching and hanging out with my Buff Braham, those 2 are like peas in a pod.