just recently my dog has been attacking my chickens it started out with her just rounding them up and chasing them back into their coop. 3 days ago I went outside to find one of my girls Mary all huddled up in the corner of the yard with some feathers on the back of your neck pulled. I took her inside and she warmed up and was fine. the next day I went outside and found one of my chickens dead and torn apart in the middle of the yard. I looked for Mary and she was huddled up in the side yard with a big gash taken out of the back of her neck, its really bad I didn't know if she would make it. We are on day two and she's doing okay she's up and walking around but I've never had chickens before and don't know how to help her please help me help Mary.