Horse Noisy Breathing: Wheezing, Roaring, Stertor & What It Means

Noisy breathing can come from either the upper airway or the lower airway, and the sound often gives a clue. Roaring is a classic inspiratory noise linked to recurrent laryngeal neuropathy, also called laryngeal hemiplegia, where one side of the larynx does not open normally during inhalation. It is especially noticed during exercise and may come with poor performance or exercise intolerance. Stertor is a lower-pitched snoring or snuffling sound that more often suggests narrowing in the nose, pharynx, or soft palate region.

Wheezing is more often associated with the lower airways and can occur with equine asthma, where inflammation and mucus narrow the small airways. Horses with asthma may also cough, have nasal discharge, or show an increased expiratory effort, especially in dusty barns or around hay. Some horses are quiet at rest and only make noise or struggle during work.

Other important causes include dorsal displacement of the soft palate, pharyngitis, arytenoid chondritis, guttural pouch disease, respiratory infection, and occasionally bleeding or masses in the airway. A horse with intermittent swallowing problems, feed material from the nose, nosebleeds, or facial nerve changes needs prompt veterinary attention because those signs can point to more serious upper airway disease.

Because several very different problems can sound similar from the aisle, your vet usually needs to listen to the horse at rest, sometimes after exercise, and often perform upper airway endoscopy to identify where the noise is coming from.

See your vet immediately if the noise is paired with labored breathing, marked nostril flare at rest, anxiety, blue or muddy gums, collapse, inability to exercise even lightly, or a sudden change after choking, sedation, trauma, or a suspected allergic reaction. Emergency care is also important if your horse has feed or water coming from the nose, repeated nosebleeds, fever, or obvious distress. Severe upper airway obstruction can become life-threatening quickly.

A same-day or next-day appointment is wise if the noise is new, recurring, or getting louder, even if your horse still seems comfortable. That is especially true if there is coughing, nasal discharge, reduced stamina, weight loss, trouble swallowing, or a recent respiratory illness. Exercise-only noise is not always an emergency, but it should not be ignored in a performance horse.

You may be able to monitor briefly at home if the sound is mild, your horse is bright and eating normally, breathing comfortably at rest, and the noise seems tied to dusty hay or a temporary mild upper respiratory irritation. Even then, keep notes on when it happens, whether it is during inhalation or exhalation, and whether performance changes are showing up. If the sound lasts more than a few days, returns repeatedly, or worsens, contact your vet.

Your vet will start with a history and physical exam, including when the noise occurs, whether it is on inhalation or exhalation, and whether your horse also has coughing, nasal discharge, poor performance, or swallowing changes. They will assess breathing effort, listen to the chest and upper airway, and may watch your horse breathe after exercise if the problem is mainly work-related.

A common next step is upper airway endoscopy, which lets your vet directly examine the nasal passages, pharynx, larynx, and openings to the guttural pouches. In some horses, a resting scope is enough. In others, especially athletes with intermittent exercise noise, your vet may recommend dynamic endoscopy during exercise or referral for more advanced airway evaluation.

If lower airway disease is suspected, your vet may discuss additional testing such as a rebreathing exam, tracheal wash, bronchoalveolar lavage, or bloodwork. Horses with fever, discharge, or suspected infection may need a more complete infectious workup. If there is concern for severe obstruction, your vet will focus first on stabilizing the airway before pursuing a full diagnosis.

Treatment depends on the cause. Options may include environmental changes for asthma, anti-inflammatory medication, rest from work, treatment for infection, or surgery for selected upper airway disorders such as recurrent laryngeal neuropathy or other structural problems.

If your horse is breathing comfortably and your vet agrees home monitoring is appropriate, focus on reducing airway irritation. Offer good ventilation, avoid sweeping or shaking out dusty bedding near the horse, and discuss lower-dust forage strategies with your vet. Many horses with inflammatory airway disease do better when dust exposure is reduced consistently, not only on bad days.

Hold off on hard exercise until your vet says it is safe. Exercise can make some upper airway problems much more obvious and can worsen distress in horses already struggling to move air. Keep a short log of when the noise happens, what it sounds like, whether it is tied to work or feeding, and whether there are other signs like coughing, nasal discharge, or reduced stamina.

Do not give leftover medications or supplements for breathing problems without veterinary guidance. Steroids, bronchodilators, sedatives, and anti-inflammatory drugs all have situations where they may help, but they can also mask signs, complicate diagnosis, or be unsafe in the wrong horse. If your horse develops effortful breathing, worsening noise at rest, or trouble swallowing, contact your vet right away.