Our Pit mix has broken into the coop twice now. I've lost 2 of my nicest hen's to her. She doesn't bother my cats and she isn't interested in my rabbits but she can't leave my hens alone. Of course we're gonna fortify the coop a bit more. The first time she got in it was at a seem in the wire that she was able to work open despite overlap and wire fasteners, the second time she was able to push the 200lb run away from the coop and squeeze between them. She's very strong and very smart. We knew each time she had done these by her submissive posture when she greeted us coming home. She understands that she is NOT SUPPOSED TO EAT THE CHICKENS but she doesn't seem to be able to control her urges. Lead pills are not an option so don't go there.