My 6 month old Belgian D'anver pullet was apparently fine this morning, laid her egg, ate some treats, then at 3 pm today started (symptoms in bold) making low noises with each inhale/exhale. The inhale sounds like little squeaks, the exhale sounds like a tomcat or stray cat saying mrrowwwww low, like a cat warning meow. Or like a fireplace bellows. At times it's followed by a sharp, high pitched cough. Sound is just amplified when you put an ear to her chest. No rattles, no gurgling. No discharge from ears, nothing apparent in throat and no redness. Appetite is good. Any guesses? Any suggestions on what antibiotic to use? I have bird tetracycline for small birds as a general one, and a couple for cocci infections. Anything better than tetracycline for this type of (wheezing?) cough? It may be fungal, I know. Food in the feeders in run & coop is hanging up & quite fresh/dry. It did rain for a few days early in the week. the sand in the run is still damp. I did dust the DE & dander in the coop earlier today, as I do every few days. It made some dust clouds. Could this have made her sound like a fireplace bellows?