Idiopathic Pulmonary Fibrosis in Donkeys: Chronic Lung Scarring

Idiopathic pulmonary fibrosis is a chronic lung disease where normal lung tissue is gradually replaced by scar tissue. In donkeys, that scarring makes the lungs stiffer and less able to move oxygen into the bloodstream. The result is ongoing breathing difficulty, poor exercise tolerance, and a condition that often progresses over time rather than clearing with routine treatment.

In donkey medicine, pulmonary fibrosis is recognized most often in older animals. Reports from donkey populations have found it to be a common respiratory problem in geriatric donkeys, and it can be mistaken for severe donkey asthma because both conditions can cause cough, fast breathing, and increased effort at rest. The word idiopathic means the exact trigger is not always clear, even after a workup.

Some cases in donkeys have been linked with asinine gammaherpesviruses, especially AsHV-4 and AsHV-5, but that does not mean every donkey with lung scarring has a confirmed viral cause. Your vet may describe the disease as interstitial pulmonary fibrosis or chronic fibrosing lung disease depending on the imaging and test findings.

The exact cause is often uncertain. That is why the condition is called idiopathic. In many donkeys, your vet may suspect a mix of age-related lung change, chronic inflammation, repeated airway irritation, and possible infectious triggers rather than one single cause.

Research in donkeys has found an association between pulmonary fibrosis and asinine gammaherpesviruses, especially AsHV-4 and AsHV-5. These viruses have been detected in donkeys with fibrosing lung disease, but the relationship is still being studied. In practical terms, a positive viral test may support the overall picture, yet it does not always prove that the virus alone caused the scarring.

Other conditions can mimic or contribute to chronic lung scarring, including severe asthma, bacterial lower airway infection, pleural disease, parasitic migration, neoplasia, and long-term exposure to dusty forage or poorly ventilated housing. Because of that, your vet usually approaches pulmonary fibrosis as a diagnosis reached after ruling out other important causes of breathing trouble.

Diagnosis starts with a careful history and exam. Your vet will look at breathing rate and effort, listen to the lungs, assess body condition, and ask about cough, exercise tolerance, housing, forage dust, and how long the signs have been present. Donkeys often understate illness, so subtle changes in stamina or attitude can be important clues.

Chest imaging is usually the next step. Thoracic radiographs may show a diffuse interstitial pattern, while ultrasound can identify abnormal lung surface, consolidation, pleural fluid, or irregular changes that support chronic lung disease. Airway endoscopy, tracheal wash, or bronchoalveolar lavage may be recommended to look for inflammation, bacteria, or viral material and to help separate fibrosis from asthma or pneumonia.

Bloodwork can help assess overall health and look for complications, but it does not confirm fibrosis by itself. In more complex cases, your vet may discuss referral for advanced imaging, repeated airway sampling, or ultrasound-guided lung biopsy. A biopsy can provide the strongest confirmation, but it is not appropriate for every donkey because respiratory compromise, handling stress, and procedure risk must be weighed carefully.

There is no guaranteed way to prevent idiopathic pulmonary fibrosis because the exact cause is not fully understood. Still, good respiratory management may reduce ongoing airway irritation and help your vet catch problems earlier. Keep housing well ventilated, avoid moldy or dusty hay, feed low-dust forage when possible, and reduce exposure to poorly bedded enclosed spaces.

Routine observation matters. Older donkeys are especially good at masking chronic disease, so watch for subtle changes in breathing rate, stamina, cough, appetite, and body condition. Early evaluation of chronic cough or exercise intolerance may help identify treatable problems before severe distress develops.

Biosecurity and herd health also play a role. Isolate donkeys with new respiratory signs until your vet advises otherwise, keep vaccination and parasite control plans current for your herd, and work with your vet on age-appropriate wellness exams. These steps may not prevent fibrosis itself, but they can lower the burden of other respiratory disease that complicates already fragile lungs.