No her food is always fresh. She might have eaten some moldy grass last week, but we took it out just as soon as we found it. She opens her mouth to breath
Moldy grass might have done it! Seriously I had the same thing happen with some moldy feed last year to some of my chickens. Gasping for breath- aspergillosis. Fungal pneumonia.
http://msucares.com/poultry/diseases/disfungi.htm
Please note that I am just guessing and don't know what is wrong with your chicken!
Last edited: