Upper Airway Issues in Horses
A horse inhales 3.5 liters per second of air at rest and 70 liters per second at maximum exertion.
Addressing the Issue
At least a dozen upper airway pathologies can cause respiratory noise.

If your horse produces roaring, whistling, gurgling, or fluttering noises during exercise, he might have an upper airway blockage compromising his breathing. Work with your veterinarian to create a diagnostic and management plan.