Hi all, Bourbon, my mustang has heaves.....from everything I've read. Dust really makes him cough, dusty hay must be soaked and if he is ridden for longer than about 45 min he coughs. I've been seeing some type of lumps on his stomach too, at first I thought it was fly bites right after the flies got bad here, but after making sure he was covered with fly spray and gnat away, the welts have gotten even bigger. I thought maybe worrbles(sp), but a vet tech checked and said that wasn't it either. Then I heard that along with the coughing a heavey horse will get hives? Yes/No any ideas would be greatly appreciated. The welts don't seem to bother him at all and they aren't open sores or anything I just don't like the way they look. Any info? Thanks!