Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
Welcome to my forum.
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All the best,
Dr. Getty
Hi Rhonda,
It could be an allergy or a reaction to dust, perhaps from being stalled more than before, due to cold weather, or from dusty feed or hay.
So, the first approach would be to examine his environment to see if he is not getting the fresh air that he needs.
The next approach is to add antioxidants to the diet to help reduce the inflammation caused by irritants. You didn't mention what you are feeding, but if you are currently adding a multiple vitamin/mineral supplement to his diet, I would suggest replacing it with something more potent in antioxidants such as PreOx.
Hope this helps. Keep me posted!
All the best,
Dr. Getty 
Where are you from? Bayfield, CO