10-24-2009, 01:55 AM
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He could have developed heaves. And they have this heavy cough. And the feed very well could be the source. My horse developed it a few years ago, and once I changed his hay, and took him off alfalfa, he stopped coughing.
There are meds for it, but if changing the feed helps, why give yer horse a medicine, especially since the meds can have side effects.