I was just outside today and I heard one of my RSL hen sneezing and when she breathes she sounds congested. There is a lot of dust in the pen and they have some mites I am treating, but not many. I didn't introduce any new chickens to my flock. The only thing I can think of is that about 9 days ago I went to an auction, but didn't get anything. Could I of possibly came home with a disease or something on my clothes? I have about 28 chickens and only one is doing this. Any advice? Does a feed store carry something I can treat her with if there is a disease? I can't afford to go to a vet or anything expensive so I would have to get something at a feed store.