Laryngeal Paralysis in Donkeys: Causes of Upper Airway Noise and Distress

Laryngeal paralysis is a disorder of the voice box, or larynx, where the cartilage that should open the airway during breathing does not move normally. In equids, this is often discussed as laryngeal hemiplegia or recurrent laryngeal neuropathy, because the problem commonly affects one side, especially the left. When the airway opening stays too narrow, air movement becomes turbulent and your donkey may make a high-pitched whistle, a harsh roaring sound, or show obvious effort when breathing.

In donkeys, upper airway disease can be easy to miss at first because some animals are stoic and may not show dramatic signs until the narrowing is more advanced. A donkey with mild disease may only seem noisy during exercise or when excited. More serious cases can lead to exercise intolerance, heat stress, distress, and in rare situations, life-threatening airway compromise.

Although much of the veterinary literature comes from horses, the same basic anatomy and airway mechanics apply to donkeys. Donkeys also have some respiratory tract differences that can make airway disease more challenging to recognize and assess. That is why any persistent upper airway noise, reduced performance, or breathing effort deserves a prompt exam with your vet.

The most common mechanism is dysfunction of the recurrent laryngeal nerve, the nerve that controls the muscle responsible for opening the arytenoid cartilage. When that nerve does not work well, the cartilage cannot fully abduct during inhalation. In equids this is often left-sided and may be progressive. In some animals, no single trigger is found, and the condition is considered idiopathic.

Possible contributing causes include nerve injury, trauma to the neck, inflammation or infection near the nerve pathway, pressure from masses, and complications related to nearby structures such as the guttural pouch. Older equine references also describe associations with toxic or neurologic disease. In donkeys specifically, upper airway problems have been reported secondary to conditions such as hepatic failure and guttural pouch disease, so your vet may need to look beyond the larynx itself.

Not every noisy donkey has laryngeal paralysis. Other conditions can sound similar, including dorsal displacement of the soft palate, epiglottic entrapment, pharyngeal collapse, laryngeal cysts, arytenoid chondropathy, tracheal disease, dental-related upper airway issues, and lower airway disease. That is one reason a hands-on exam and airway visualization matter so much.

Diagnosis starts with a careful history and physical exam. Your vet will ask when the noise happens, whether it is getting worse, how your donkey tolerates exercise, and whether there has been trauma, recent illness, weight loss, fever, or swallowing trouble. Listening to breathing at rest and after controlled exercise can help localize whether the sound is coming from the upper airway.

The key test is usually upper airway endoscopy, which allows your vet to directly watch the larynx open and close. In equids, laryngeal function is commonly graded from mild weakness to complete paralysis. Some donkeys need the exam while unsedated, after exercise, or at a referral center if signs only appear during work. Endoscopy also helps rule out look-alike problems such as soft palate disorders, cysts, inflammation, or guttural pouch disease.

Depending on the case, your vet may also recommend bloodwork, ultrasound, radiographs, guttural pouch evaluation, or referral for advanced airway assessment. If breathing distress is severe, stabilization comes first. In emergency cases, oxygen support, sedation, and sometimes a temporary tracheostomy may be needed before a full workup can continue.

Not every case can be prevented, especially when the problem is related to progressive nerve dysfunction. Still, there are practical steps that may lower risk or help your vet catch trouble earlier. Good halter fit, careful handling around the neck, prompt treatment of wounds or swelling, and thoughtful injection technique by veterinary professionals can help reduce avoidable nerve trauma.

Routine health care also matters. Work with your vet to address respiratory infections, guttural pouch disease, dental problems, and any neurologic or systemic illness that could affect swallowing or airway function. If your donkey develops new exercise noise, reduced stamina, or breathing effort, early endoscopy can identify a problem before it becomes a crisis.

For donkeys already diagnosed with laryngeal dysfunction, prevention is really about preventing flare-ups and emergencies. Avoid overexertion in heat, reduce dust exposure, keep body condition appropriate, and follow your vet's plan for rechecks. A donkey that breathes comfortably at rest can still struggle during transport, stress, or exercise, so management decisions should match the individual animal.