I want to say thank you for this post.
My mare has always coughed some, from time to time.
Lately she is coughing more and I was starting to worry about it. She does not seem to care that she coughs, but it was just enough that it was past no big deal.
Now that you posted this I have thought about the timing and her cough got worse after I switched to Unbeetable Forage Only.
I did not figure the cough could be related to that because when I switched to this feed, I also added water to her feed. (I wanted to help her supplements stick a little better since she would leave the powder in her feed tub.) So why would a not dusty feed be making her cough?
I guess I will see if something changes if I go back to plain alfalfa pellets.
I hope it is not this feed, because I really like this feed, and my horse really likes this feed.