I researched Heaves some, and watched a few videos of horses with heaves.
Arrow doesn't have a cough, I've never heard him cough. Could it still be heaves?
He's also kept in a large field and isn't exposed to much dust
He also doesn't breathe anything like the horses in the videos I watched. He breathes very normally while resting.
He never seems to be struggling for breath, and is very active and energetic. He loves to run and has a shiny, dappled coat.
All of this is making me lean towards its just being allergies, or maybe a cold.
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