Sheep Circling: Causes, Brain Disease Signs & What to Do Now

Circling in sheep most often points to a problem affecting the brain, brainstem, balance system, or cranial nerves. One of the best-known causes is listeriosis, a bacterial infection that can inflame the brainstem. Sheep with listeriosis may seem depressed, stop eating, lean into corners, circle to one side, drool, or develop facial weakness and trouble chewing or swallowing. The course can be fast, and death may occur within 24 to 48 hours after signs begin if treatment is delayed.

Another important cause is polioencephalomalacia (PEM), a neurologic disease linked to thiamine disruption and sometimes high-grain feeding or sulfur-related problems. Sheep with PEM may become disoriented, wander, act blind, press their head, hold the head back, or progress to seizures and recumbency. Inner ear disease can also cause tight circling, head tilt, falling, and loss of balance. In those cases, sheep are often more alert than animals with brain inflammation.

Less common but serious causes include type D enterotoxemia, brain abscess, coenurosis (gid), trauma, and other inflammatory or toxic brain diseases. Brain abscesses and coenurosis can cause circling along with blindness or proprioceptive deficits, while enterotoxemia may cause sudden neurologic decline, head pressing, and death. Because these conditions overlap so much, your vet usually needs the history, exam findings, and response to treatment to sort out the most likely cause.

See your vet immediately if your sheep is circling, especially if the behavior is new, constant, or paired with other neurologic signs. Emergency signs include not eating, fever, depression, head tilt, blindness, drooling, facial droop, trouble swallowing, falling, seizures, lying down and unable to rise, or pushing into walls or corners. These patterns can fit listeriosis, PEM, severe ear disease, or another brain disorder, and several of them can worsen quickly.

There is very little true "wait and see" room with circling. Even if the sheep is still standing, bright, and drinking, circling suggests a problem that deserves same-day veterinary advice. Monitoring at home is only appropriate while you are actively arranging care and keeping the sheep safe.

While waiting for your vet, separate the sheep from the flock into a small, quiet pen with good footing. Remove hazards, provide shade or shelter, and place water and palatable feed within easy reach. Do not force-feed, drench, or give leftover medications unless your vet specifically tells you to, because sheep with neurologic disease may have trouble swallowing and can aspirate.

Your vet will start with a focused history and neurologic exam. They will want to know when the circling started, whether the sheep is eating, if there has been a recent feed change, silage exposure, grain overload risk, pregnancy or lambing stress, trauma, ear discharge, or other flockmates with similar signs. On exam, your vet may check temperature, hydration, mentation, menace response, facial symmetry, swallowing, head tilt, gait, and whether the sheep circles consistently to one side.

In many field cases, treatment begins based on the most likely causes rather than waiting for every test result. If listeriosis is high on the list, your vet may start aggressive antibiotics and anti-inflammatory care right away. If PEM is possible, thiamine is often given promptly because early treatment can be time-sensitive. Supportive care may include fluids, nursing care, and help with nutrition if the sheep cannot eat safely.

Depending on the case, your vet may also recommend bloodwork, fecal or feed review, ear evaluation, or postmortem testing if an animal dies and flock risk is a concern. Advanced referral workups can include imaging or cerebrospinal fluid testing, but these are less common in field sheep practice and are usually reserved for valuable breeding animals, unclear cases, or animals not responding as expected.

Home care for a circling sheep is mainly about safety and support while your vet guides treatment. Keep the sheep in a small pen or stall with deep bedding, good traction, and no sharp edges or places to get stuck. Reduce stress, keep flock pressure low, and place water and hay where the sheep can reach them without walking far. If the sheep is falling or leaning, padding the sides of the area can help prevent injury.

Watch closely for swallowing problems, worsening depression, seizures, or inability to stand. Sheep with neurologic disease may look interested in food but be unable to chew or swallow normally. That is one reason force-feeding or drenching can be risky unless your vet has shown you a safe plan. If your vet prescribes medications, give them exactly as directed and keep a written log of appetite, temperature if requested, manure output, and whether the circling is improving.

Also think beyond the individual sheep. Check for spoiled silage or fermented feed, sudden grain access, ration changes, and anything that could have exposed the flock to toxins or parasites. If dogs have access to sheep carcasses or offal, ask your vet about parasite control and flock prevention steps. Quick action for one sheep can sometimes prevent a larger flock problem.