Horse Nasal Discharge: Clear, Cloudy, Bloody or Feed From the Nose

Nasal discharge in horses can range from harmless to urgent. A small amount of clear, watery discharge may happen after exercise, in cold weather, or with dust and pollen exposure. But discharge that persists, becomes thick, smells bad, or is paired with fever, cough, poor appetite, or dullness deserves veterinary attention.

Color and pattern matter. Clear discharge is more often linked with irritation, allergies, or early viral respiratory disease. Cloudy, white, yellow, or green discharge is more concerning for infection, including equine influenza, equine herpesvirus with secondary bacterial infection, strangles, sinusitis, pneumonia, or guttural pouch empyema. If several horses are affected, think contagious disease until your vet says otherwise.

Whether the discharge comes from one nostril or both also helps narrow the list. One-sided discharge is more suggestive of sinus disease, tooth root infection, ethmoid hematoma, a nasal mass, or localized bleeding. Foul odor especially raises concern for dental or sinus disease. Both nostrils are more common with viral infections, lower airway disease, allergies, or choke.

If feed, water, or frothy saliva comes out of the nose, choke is high on the list. Horses with choke may drool, cough, repeatedly try to swallow, and worsen if allowed to keep eating or drinking. Bloody discharge can come from trauma, exercise-induced pulmonary hemorrhage, ethmoid hematoma, sinus disease, or the guttural pouch. Recurrent or heavy nosebleeds are never something to watch casually.

You may be able to monitor briefly if your horse has a tiny amount of clear discharge, is bright and eating normally, has no fever, no cough, and no breathing changes. Even then, keep a close eye on duration and progression. If the discharge lasts more than a day or two, becomes thicker, or new signs appear, contact your vet.

Schedule a prompt exam if the discharge is cloudy, yellow, green, or foul-smelling; if it comes from only one nostril; or if your horse also has fever, cough, swollen lymph nodes, bad breath, reduced appetite, or exercise intolerance. Isolate the horse from others until your vet advises otherwise, because several infectious causes spread through nasal secretions and shared buckets, tack, or close contact.

See your vet immediately if feed or water is coming from the nose, your horse is repeatedly trying to swallow, or there is drooling and distress. That pattern is very concerning for choke or a swallowing disorder. Remove feed, do not offer water, and do not give oral medications, oil, or mash unless your vet specifically instructs you to.

Heavy bleeding, repeated nosebleeds, noisy breathing, facial swelling, marked lethargy, or labored breathing are also emergencies. Intermittent mild bleeding can still be serious in horses because guttural pouch mycosis can cause sudden, catastrophic hemorrhage. If you see blood from the nose and do not know why, treat it as urgent.

Your vet will start with a full history and physical exam. Expect questions about when the discharge started, whether it is one-sided or both-sided, color and odor, recent travel or new horses, vaccination status, coughing, fever, dental history, exercise, and whether feed or water has come from the nose. They will usually check temperature, breathing effort, airflow from each nostril, lymph nodes, oral cavity, and the throatlatch area.

From there, diagnostics are chosen based on the pattern of signs. Common next steps include upper airway endoscopy, nasal swab or wash for PCR testing, bloodwork, and sometimes ultrasound or radiographs of the head and chest. If sinus or dental disease is suspected, your vet may recommend skull imaging and a dental exam. If strangles or another contagious respiratory disease is possible, your vet may advise isolation and targeted testing.

When choke is suspected, your vet often sedates the horse and passes a tube to assess and carefully relieve the obstruction. Horses with choke may need repeated lavage, anti-inflammatory medication, and monitoring for aspiration pneumonia. If the problem is in the guttural pouch, endoscopy is especially important because it can identify pus, chondroids, fungal plaques, or nerve involvement.

Treatment depends on the cause. Options may include rest and dust reduction, anti-inflammatory medication, antibiotics when bacterial infection is confirmed or strongly suspected, guttural pouch lavage, dental treatment, sinus procedures, or referral for advanced imaging or surgery. Your vet will match the plan to your horse's signs, risks, and your goals.

Home care should support your vet's plan, not replace it. Keep your horse in a clean, well-ventilated area with low dust exposure. Avoid moldy hay and dusty bedding. If your vet agrees, soaking or steaming hay and improving airflow in the stall can reduce airway irritation during recovery.

Take and record your horse's rectal temperature once or twice daily if respiratory disease is suspected. Note appetite, water intake, cough, breathing effort, and whether the discharge changes color, smell, or side. If there are other horses on the property, use separate buckets, avoid nose-to-nose contact, and wash hands and equipment after handling the affected horse.

If your horse has had choke or may be choking, do not offer feed, treats, or water until your vet gives instructions. Never syringe liquids or give oral medications unless your vet specifically tells you to. After treatment, your vet may recommend a temporary softened-feed plan and a slow return to normal feeding while the esophagus heals.

Do not insert anything into the nostrils or try to flush the nose at home. Do not ignore blood from the nose, especially if it recurs. Call your vet sooner rather than later if your horse develops fever, cough, trouble breathing, bad breath, facial swelling, depression, or reduced eating.