Sorry to hear about your roo. If he survives, he may just surprise you. I had a barred rock that was attacked by a coyote. I cared for him like he was my own baby. He had injuries to his back an bottom. But, not only did he survive he went back to work patrolling the pens a week after the attack. He was a year old at the time of the attack. If your rooster crows, it will be a good sign. If it turns out that he can't go back to the flock, he can live in your garage or have a roo cave.