Shivers in Donkeys: Trembling, Hindlimb Abnormalities & Long-Term Management

Shivers is a chronic abnormal movement disorder described most often in horses, but the same pattern can be recognized in donkeys because they are equids and share similar neurologic and musculoskeletal diseases. The classic sign is a sudden, exaggerated lifting and outward movement of one hind leg, often with trembling, especially when the animal is asked to back up or when a hind foot is picked up for trimming. Merck’s equine reference materials describe this hallmark hindlimb hyperflexion and abduction during backing in affected equids.

In many donkeys, the problem starts subtly. A pet parent may notice that the donkey hesitates when backing, snatches a hind leg away during hoof handling, or seems stiff behind after standing. Over time, some animals develop more obvious trembling, difficulty balancing on three legs, or trouble stepping backward into a trailer or narrow space.

Shivers is usually considered a long-term management condition, not a quick-fix problem. Some donkeys remain mildly affected for years, while others become harder to trim or handle safely. Because donkeys often hide discomfort and can look stoic even when struggling, early changes in gait or hoof-handling behavior are worth discussing with your vet.

The exact cause of shivers is still not fully settled, even in horses. Current veterinary literature describes it as a neuromuscular or movement disorder rather than a simple behavior problem. Research in horses has suggested involvement of abnormal control of hindlimb movement, and some studies have found changes in the cerebellum, a part of the nervous system that helps coordinate motion.

That said, not every donkey with hindlimb trembling has true shivers. Your vet may need to sort it from stringhalt, lameness, hock or stifle pain, upward fixation of the patella, sacroiliac pain, muscle disease, equine motor neuron disease, vitamin E deficiency-related problems, or spinal/neurologic disease. In some equids, more than one issue is present at the same time, which can make the gait look more dramatic.

There is also no strong evidence that pet parents can reliably prevent shivers through one supplement or one management change. However, balanced nutrition, regular movement, and prompt workup of hindlimb abnormalities matter because low vitamin E status, muscle disease, pain, and prolonged inactivity can worsen gait quality in equids with overlapping problems.

For donkeys specifically, published condition-specific data are limited compared with horses. Because of that, your vet will often use the broader equine evidence base, then adapt it to donkey body condition, diet, hoof shape, temperament, and workload.

Diagnosis starts with a hands-on exam and gait evaluation. Your vet will usually watch your donkey walk, turn, and back up, because backing often brings out the most recognizable signs. They may also observe what happens when a hind foot is lifted, since affected equids can suddenly hyperflex, tremble, or pull the limb away.

From there, your vet may recommend a more complete neurologic and lameness workup to rule out look-alike conditions. Depending on the case, that can include hoof testers, flexion tests, sedation-assisted hoof handling, bloodwork, vitamin E testing, and imaging such as radiographs or ultrasound if joint, hoof, or soft-tissue pain is suspected.

Advanced cases may need referral for a specialty equine or farm-animal evaluation, especially if the signs are severe, rapidly worsening, or mixed with weakness, ataxia, or weight loss. Referral centers may consider additional imaging or muscle and nerve testing in selected patients, but many donkeys are diagnosed based on history, exam findings, and exclusion of other causes.

A practical point for pet parents: video helps. If your donkey acts worse during farrier visits, trailer loading, or backing out of a stall than during a routine appointment, short phone videos can give your vet valuable real-world information.

There is no proven way to fully prevent shivers, especially if a donkey is predisposed to developing a chronic movement disorder. Still, good general management can reduce stress on the hindlimbs and help your vet catch changes earlier. Aim for regular turnout, steady exercise that matches fitness level, safe non-slip footing, and routine hoof care on a predictable schedule.

Nutrition matters too. Donkeys should have a balanced ration designed for their body condition and workload, with special attention to avoiding both obesity and nutrient gaps. Because low vitamin E can contribute to some equine neuromuscular problems, your vet may recommend diet review or testing in selected cases rather than guessing with supplements.

Prevention also means not ignoring subtle signs. If your donkey starts resisting hind-foot handling, backing awkwardly, or trembling behind, early evaluation may uncover a treatable pain issue or another condition that looks like shivers. Even when the diagnosis is true shivers, earlier management often makes hoof care and daily handling safer for everyone.

For long-term success, think in terms of support rather than cure: consistent routines, low-stress handling, and regular rechecks with your vet if the gait changes. That approach gives many donkeys the best chance to stay comfortable and functional.