I did a bunch of reading and found out alergies are not unheard of in horses, so I called my local tack shop and found out they had an omega alpha brand product(respi-free), natural ingredient based, that was supposed to help with alergies. I thought it was worth a try, the vet couldn't come for a week any ways. Three doses(on her grain, she loved the taste) and I havent seen a cough since. I'm super impressed. Has anyone else had experience with this brand?