We got our very first flock in March - 3 hens and a rooster and have had good luck with them- no serious problems. This is the first time I've posted and I'm really concerned and my local vet doesn't do chickens so I'm not sure if anyone here knows what to do. Our chickens were out free roaming the other (like many days in the past) and we got home about 7:00 and I went to go shut them up since they were already in the coop and found our rooster with his rear end darn near taken off. I'm thinking now that whatever got a hold of him was scared away when we pulled up because I cannot believe he's not dead. Everytime he moved, the tooth mark holes were making whistling noises like a punctured lung but from his rear. He seemed alert- in pain but he was up on his perch and had moved around so we left him for the night not sure what we would find in the morning. Well yesterday morning, he was wide awake and alert and when I opened their door to their run, he flew right down from his perch and went outside with the girls. He seems to be acting just fine. My husband even feed him meal worms so I know he's eating. Well tonight, I went inside and took a look and his skin is turning green. I'm assuming infection? Unless their bare skin reacts without having any feathers. Can I give him antibiotics? Is there anything we can do or should we just put him down? I'm attaching 2 pictures of when we first found him (and possibly a video if it'll let me post it) and some pics of what I got toninght. Please help me out!