My Silkie hen has been getting progressively worse over the past month or so. It started with her losing her crest & beard feathers. I thought her Roo was being too rough on her but I am not sure as nothing is growng in. Now she is panting & sneezing. (Can't figure out how to upload video of her open mouth panting). I have tetracycline to start her on tonight. She has been separated from the flock (with her Roo for company) most of the time because of the cold. She is kept in the garage whenever it hits 33 degrees. Any guesses on what could cause feather loss like that & cold symptoms?