My horse got quite sick in August and had quite a cough. After having the vet check him out and a couple weeks of meds he still had quite a dry cough when he would work at all. I used Omega Alpha Respi-Free to help him with it when I rode but that started to get expensive so I switched him to the Silver Lining Herbs Respritory Support, and it is pretty much cleared up. When in a super dusty arena he still coughs a bit, but I so do I.
*Dont let your fears stand in the way of your dreams*