Donkey Fever: Causes, Symptoms That Go With It & When to Call a Vet

Fever means your donkey's body is reacting to something, most often infection or inflammation. In donkeys, many causes overlap with horses because they are both equids. Common infectious causes include respiratory viruses such as equine influenza and equine herpesvirus, bacterial infections such as strangles, tick-borne anaplasmosis, and Potomac horse fever. Fever may also happen with infected wounds, hoof abscesses, pneumonia, uterine infection after foaling, dental infection, or severe gastrointestinal inflammation.

Some causes spread between equids, while others are linked to insects, ticks, or the environment. A donkey with a new fever after travel, boarding, shows, contact with unfamiliar equids, or heavy insect exposure deserves prompt attention. Potomac horse fever is especially important in some US regions because it can cause fever followed by diarrhea and may be associated with laminitis.

Not every fever starts with obvious local signs. Early in the course of illness, your donkey may only seem quiet, eat less, or stand apart from companions. Because donkeys often hide discomfort, even a mild-looking fever can go with a more significant problem than it first appears.

Your vet will use the full picture, including temperature, appetite, manure, breathing, travel history, vaccination status, tick exposure, wounds, and hoof pain, to narrow the cause. The goal is not only to lower the temperature, but to find out why the fever is happening.

See your vet immediately if your donkey has a temperature of 101.5°F or higher and also has trouble breathing, repeated coughing, thick nasal discharge, severe lethargy, diarrhea, colic signs, neurologic changes, pregnancy-related concerns, or signs of laminitis such as shifting weight, reluctance to walk, or a rocked-back stance. These combinations can point to contagious respiratory disease, serious intestinal disease, sepsis, or painful inflammatory conditions that should not wait.

A same-day call is also wise if the fever lasts more than a few hours, returns after seeming to improve, or happens in a donkey that recently traveled, mixed with other equids, had a wound, tick exposure, or a hoof problem. If more than one equid on the property is affected, isolate the sick animal and call your vet promptly because some causes are contagious.

You may be able to monitor briefly at home only if your donkey is bright, drinking, eating reasonably well, breathing normally, passing normal manure, and has no other concerning signs. Even then, recheck the rectal temperature, keep notes, and contact your vet if the fever persists, climbs, or new symptoms appear.

Do not rely on fever alone to judge severity. Donkeys can mask pain and illness, so a quiet donkey with a mild fever may still need urgent care. When in doubt, a call to your vet is the safest next step.

Your vet will start with a physical exam and history. That usually includes confirming the temperature, checking heart and breathing rates, listening to the lungs and gut, examining the feet, looking for wounds or swelling, and asking about travel, herd exposure, vaccination history, tick exposure, appetite, manure changes, and recent stress.

Basic testing often includes a complete blood count and chemistry panel, and many equine fever workups also use fibrinogen or serum amyloid A to look for inflammation. Depending on the signs, your vet may recommend nasal swabs for respiratory PCR testing, blood testing for tick-borne disease, fecal or infectious disease testing, or a Coggins-related review if equine infectious anemia is a concern. If your donkey has cough, nasal discharge, diarrhea, limb swelling, or lameness, your vet may add ultrasound, radiographs, or hoof evaluation.

Treatment depends on the likely cause and how sick your donkey is. Options may include anti-inflammatory medication prescribed by your vet, fluids, targeted antibiotics when a bacterial infection is suspected or confirmed, hoof abscess treatment, wound care, or hospital-level supportive care. If a contagious disease is possible, your vet may recommend isolation, temperature monitoring of other equids, and stricter biosecurity.

In some cases, the first visit focuses on stabilization and narrowing the list of causes. If the fever does not respond as expected, your vet may step up to additional bloodwork, imaging, culture, or referral-level care.

Home care should support, not replace, veterinary guidance. Keep your donkey in a quiet, well-ventilated area with easy access to clean water, shade or shelter, and palatable forage unless your vet advises otherwise. If contagious disease is possible, separate the donkey from other equids, use dedicated buckets and tools, and wash hands between animals.

Take and record the rectal temperature as directed by your vet, along with appetite, water intake, manure output, cough, nasal discharge, breathing effort, and comfort level. Good notes help your vet see whether the fever is improving or changing direction. If your donkey is not eating, seems painful, develops diarrhea, or becomes more depressed, update your vet promptly.

Do not give over-the-counter human fever medicines unless your vet specifically instructs you to. Medication choice and dose matter in equids, and the wrong drug can cause harm or make diagnosis harder. If your vet prescribes medication, give it exactly as directed and ask what side effects to watch for.

Comfort measures may include reducing stress, minimizing transport, keeping bedding dry and clean, and protecting sore feet if laminitis is a concern. Recovery depends on the cause, so the safest plan is regular communication with your vet until your donkey's temperature and behavior are back to normal.