So recently (as in, over the course of the past 2-3 days) my one mare has begun to exhibit a cough. She doesn't seem to appear very lethargic, have already ruled out choke, no runny nose or discharge, eating normal, and she is currently up to date on all vaccines. She is housed in close proximately to 3 other horses and no one else has seemed to come down with the same cough.
We purchased this mare back in March and she had previously been blanketed. My husband thought it was unnessasry to blanket her even back then, but I continued to do so anyway since she had been previously blanketed for most of the winter for riding purposes. All of our other horses have always grown a pretty thick winter coat and I have not needed to worry about blankets before. We have now entered into winter and the horses are either turned out or brought in, depending on the weather conditions. Here of recently, they have mainly been kept in. We do not have a typical stable set up, but rather it is a modified cover-all barn. The sides have been opened or closed, depending once again on weather and to allow for ventilation and air flow. This particular mare with the cough has not been blanketed yet at all this year. Could this be the reason for her developing a cough?
What can I do to treat the cough and to hopefully prevent it from occurring again?