I have a duck that is about six months old. He is a male and I have another male so they may have got in a fight but, there is no blood or broked legs have cheeked him good. I found him stuck in the mud and could not walk. He is eating and drinking and pooping but can not walk. Could it be his back? He is in my house and we are taking care of him the best we can. DO you think he could be fixed or should we put him down? How do we know if his back is broke?