I'm riding this horse who has had a huge problem with coughing. He's on medicine and the coughing has gotten better but it's still happening. Any suggestions?

Breath free supplements are often good. Dampen hay or change to haylage. Dust free bed and lots of ventilation. Ride outside as the air is good for there lungs.
Wet food and hay
Maybe change the hay to a wet hay
Try riding out side if its an option, wet its food and hay, helped loads with my pony 👍🏻
make his hay wet and maybe try making the arena slightly wet, it could be the dust
Wet hay
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