Dry Persistant Cough
I have an 3 year old gelding that began coughing in mid February. It started off as a wet cough and he was coughing up mucus with a runny nose, no fever. We did not get a vet out because it cleared up within a few days. After the mucus and runny nose cleared up he began to have a dry cough, no other symptoms. He was recently started under saddle, I hear him cough in the pasture as well as when I am riding him. He is in a small pasture with 3 other horses who have not had any of the same symptoms but the grass is really short which leads me to believe that is it a mold allergy, I can move him to a different pasture if necessary. Any ideas about what this could be?