Ataxia and Wobbliness in Llamas: Neurologic Causes to Know

Ataxia means uncoordinated movement. In llamas, pet parents may notice swaying, crossing the legs, stumbling, toe dragging, leaning, circling, head tilt, or trouble rising. "Wobbliness" is a useful everyday description, but it is not a diagnosis. It is a sign that the nervous system, muscles, inner ear, or sometimes the whole body is not working normally.

In llamas, neurologic wobbliness is especially important because some causes can worsen fast. Damage may involve the brain, brainstem, spinal cord, peripheral nerves, or the muscles that support movement. A llama may start with subtle hind-end weakness and progress to recumbency, or may show one-sided facial droop, depression, or abnormal eye movements if the brainstem is involved.

One of the best-known causes in camelids is meningeal worm, a parasite carried by white-tailed deer that can migrate abnormally through the spinal cord and brain of llamas and alpacas. But it is not the only possibility. Trauma, listeriosis, metabolic disease, and toxic exposures can look similar at first, which is why a prompt exam matters.

Because neurologic signs can overlap, your vet will focus on where the lesion seems to be, how quickly signs started, and what exposures your llama has had. That step-by-step approach helps build a practical treatment plan that fits the situation.

In many parts of the United States, meningeal worm is high on the list. This parasite, Parelaphostrongylus tenuis, normally lives in white-tailed deer. Llamas become infected indirectly from contaminated pasture, usually through snails or slugs. In camelids, the larvae migrate through the central nervous system and can cause asymmetric weakness, ataxia, recumbency, and sometimes death. Deer exposure raises concern, but your vet still has to rule out other causes.

Listeriosis is another important neurologic disease in ruminants and camelids. It can cause brainstem inflammation, leading to depression, one-sided facial weakness, head tilt, circling, trouble eating, and recumbency. Poor-quality or spoiled feed, including silage in some species, can increase risk. Trauma is also common enough to matter, especially after fence injuries, breeding-related accidents, transport incidents, or falls.

Your vet may also consider metabolic and nutritional problems such as severe hyperglycemia with high blood osmolarity, electrolyte disturbances, hepatic disease, or selenium/vitamin E deficiency in young animals. These may cause weakness, tremors, or abnormal neurologic behavior. Toxins are another differential, including accidental access to medicated feeds made for other livestock. Some ionophores are dangerous to camelids.

Less common but still possible causes include spinal abscesses, vertebral malformation or compression, encephalitis, inner ear disease, and congenital neurologic disorders in crias. The exact cause matters because treatment options, prognosis, and herd-level prevention can be very different.

Diagnosis starts with a careful history and neurologic exam. Your vet will look at gait, strength, cranial nerve function, mentation, spinal pain, and whether deficits are symmetric or worse on one side. That helps localize the problem to the brain, brainstem, spinal cord, peripheral nerves, or muscles. Basic testing often includes temperature, bloodwork, and sometimes mineral or metabolic screening.

If meningeal worm is suspected, cerebrospinal fluid (CSF) analysis can be especially helpful. In camelids from endemic regions, eosinophils in CSF strongly support the diagnosis when paired with compatible signs and exposure history. Your vet may also recommend fecal testing, though fecals do not reliably confirm meningeal worm in an affected llama.

Depending on the case, your vet may add radiographs, ultrasound, infectious disease testing, or referral imaging such as CT or MRI to look for fractures, spinal compression, abscesses, or brain disease. Animals that are recumbent or rapidly worsening may need treatment started before every answer is available. That is common in neurologic medicine.

If a llama dies or is euthanized, necropsy can be very valuable for the herd and for future prevention. It may confirm parasitic migration, listeriosis, trauma, toxic injury, or another cause that was not obvious during life.

Prevention depends on the cause, so the best plan is herd-specific. In deer-endemic regions, talk with your vet about meningeal worm prevention. That usually focuses on reducing exposure to white-tailed deer, limiting wet areas that support snails and slugs, managing pasture risk, and building a parasite-control plan that fits your farm. Cornell specifically includes meningeal worm prevention as part of camelid herd health guidance.

Feed management also matters. Store feed carefully, discard spoiled or moldy feed, and avoid accidental access to medicated feeds intended for other species. Keep horse and poultry feeds away from camelids unless your vet has confirmed they are appropriate. Review minerals with your vet, especially in selenium-deficient regions or if you are raising crias.

Good fencing, safe transport, and low-stress handling can reduce traumatic injuries. Routine herd checks help you catch subtle gait changes early, before a llama becomes recumbent. If one animal develops neurologic signs, isolate as needed for safety, document the timeline, and contact your vet promptly.

If a case is severe or fatal, necropsy can be one of the most useful prevention tools for the rest of the herd. A confirmed diagnosis may change pasture management, feeding practices, biosecurity, or monitoring for other animals at risk.