I left my chickens out to free range while I was gone. My grandmother was still home and noticed a stray dog in the yard and chased it off and all of my chickens were still here doing fine. When I got home, only 4 out of 5 are here and my biggest hen is gone. There aren't any feathers or blood trails. No tracks. No sign of struggle or anything. Could it be possible that the dog came back and got her? She's been molting. So I would think there would be a mess of feathers...any thoughts? I'm worried sick.