How much ventilation do you have in your coop?I've been keeping an eye on him lately because he's been sorta pitiful looking and sure enough something is wrong. First off a few weeks ago he was scratching his belly as he walked and I had just put a new roosting board up so thought he might have mites. I dusted him somewhat and the whole coop with poultry dust. Then a couple of weeks ago some dogs got after him but he seemed to just be missing feathers although still kinda in shock or something. Anyway today he is doing this labored breathing and it doesn't sound good, poor thing.
I gave him some Tylan 50 and put VetRx around his nose and in his water but I hate to hear him suffer. Suggestions anyone?
It looks like he is suffering from a respiratory illness, but it would be a good idea to look inside his beak for any obstructions, plagues/lesion or canker. Smell his breath.
You mention that he was scratching his belly as he walked? Check his crop first thing in the morning to make sure it's empty.
What dosage of Tylan50 are you giving him? How much does he weigh?