Recurrent airway obstruction (RAO), frequently referred to as heaves, negatively impacts horse health, performance, and welfare. Due to similarities between RAO and human asthma, a group of American College of Veterinary Internal Medicine (ACVIM) specialists recently updated its recommendations for RAO diagnosis and treatment. Those recommendations include adopting “equine asthma syndrome” to better describe a spectrum of chronic airway inflammatory disorders—from mild inflammatory airway disease (IAD) in young athletes to severe RAO generally observed in horses over 7 years of age.