We recently inherited an elderly but still very feisty pony. He has heaves, and has had 2 major attacks since we brought him here in September. He's currently recouperating from his last attack and is on prednisone tablets. I'm looking for some kind of natural supplement I can put him on to help prevent attacks in the future. This second time we noticed him coughing up a lot of mucus, and he also had a lot of mucus coming out of his eyes before the breathing got bad. Hopefully I can find something to help break up the mucus in his lungs when I see these early signs before it majorly affects his breathing, or even a daily supplement to keep it form building up at all. Any suggestions? He is in a paddock with a run-in shed, not a barn, his hay gets shaken out or wet down before feeding, we started mixing peat moss in with the shavings in the shed to help lesson the dust. The shed and paddock get picked clean every day. When he's not having an attack he seems to have no visible trouble breathing, and coughs very little. I also want to help strengthen his immune system somehow since he came to use very run down and underweight. Thanks for any ideas.