I'm very new to chickens (just started in November, 2013). I've been doing a lot of reading on this site and have learned a lot. I have a young Buff Orphington (about 7-8 months old) that started this gasping for air thing about a week ago (stretching with her neck out and opening her mouth). I also have a Silkie roo that had a cough/sneeze thing going on for the last couple of weeks (and still does). I believe it's an URI. I started treating with Tetroxy on Saturday (so I'm on day #4). Unfortunately, the labored breathing is getting worse. She originally wasn't making any sounds when she'd do this, but now she's making a deep cough sound. Also, it appears that all of the chickens (9 of them) are shaking their heads - not sure what this may mean. I know that I need to finish with the antibiotics (was told 7-14 days), so I don't believe I can use anything else at the same time. Any other suggestions of what I should/can do? It will break my heart to lose her!