One of our Buff Orpingtons, age 22 months, has been sneezing for two days. Also, she has been panting a bit, even though our temperatures went from 100 degrees plus nearly every day for two months, to around 80 degrees the last two days. Today, when I took some treats out to the girls, the Buff stayed away from the others, and didn't come running like everyone else. This afternoon, she did eat a bit of scratch. I am concerned about this sneezing. Any ideas? Thanks, much!