Learn what nasal discharge in horses can reveal about respiratory infections, sinus and dental disease, equine asthma, guttural pouch disorders, choke, pneumonia, and other conditions. This practical guide explains clear, thick, foul-smelling, bloody, one-sided, and bilateral discharge; warning signs that require a veterinarian; safe steps owners can take; common causes; isolation; recovery; and when a runny or snotty nose may signal an emergency.