I thought my rooster had a respiratory infection BUT no one else in the flock became ill. His eyes are clear, he is as active as his breathing allows but the breathing sounds HORRIBLE! I have looked into his mouth and cannot see anything. I have massaged his craw. He chew-swallows alot! He sounds like he has something partially blocking his airway. This has been going on for 10 days and I am stymied! Suggestions? I love this rooster!