I have a cockerel named Sidra who my sister brought in tonight because he was breathing funny. It sounds like he has fluid in his lungs, when he breathes it rattles. I treated my whole flock for a respiratory issue a few months ago, but he was very young so I didn’t do him or his brother and sister (they were living separately at the time). I’ve had no other issues since the whole flock was treated. Is this a respiratory disease or something else? What should I do for treatment? I can go to a local farm store and buy something in the morning tomorrow.