Mucus, dehydration and equine asthma - everything you need to know by Dr David Marlin

At the Hasslers' renowned dressage program, a steamed hay regimen reduces allergies & increases overall health.

"Her life is changed," Whendy reports of Sunni. "There's no more coughing, she can breathe." For fellow owners of horses with these respiratory diseases, she urges: "Eventually, if you love your horses, you are going to have to steam their hay. Things won't get better without it."