When should I be concerned about a hen that is "coughing"? We just introduced two young girls to our flock after a quarantine period and are allowing them to free range together in the day and are keeping the close but separated in the coop at night. Today, when we put them in the coop for the night, one of the older hens was "coughing". We immediately pulled her out and put her in a cage in the gardening room. Should we keep her isolated? Or could it have just been a throat clearing cough?