SYMPTOM
Circling or pacing
The dog or cat repeatedly walks in tight circles, often in one direction, or paces back and forth across a room without settling. It may appear restless, unable to find a comfortable resting position, or seem to be searching for something without a clear goal.
Vestibular Dysfunction
Disruption to the balance system, whether from inner ear disease or a problem further along the vestibular pathway, causes many animals to circle consistently towards one side, often together with a head tilt, unsteady gait, or abnormal eye movements. Onset is frequently sudden.
Middle or Inner Ear Disease
Infection or inflammation deep within the ear can affect the structures responsible for balance, producing circling that may initially look identical to idiopathic vestibular disease, particularly when there is a history of chronic outer ear problems.
Cognitive Decline
Canine and feline cognitive dysfunction can produce circling or aimless pacing as part of a broader pattern of spatial disorientation, often building gradually and worse in the evening or at night.
Compulsive Behaviour
Repetitive circling or pacing can develop as a compulsive behaviour, sometimes triggered initially by stress, confinement, or an underlying discomfort, and then persisting as a repeated pattern even once the original trigger has passed.
Anxiety-Related Restlessness
Underlying anxiety can produce pacing as a displacement behaviour, particularly around triggers such as separation, unfamiliar visitors, or environmental changes, and tends to resolve once the triggering context passes.
Intracranial Disease
A structural change within the brain, including a mass, can produce persistent circling, typically towards the side of the lesion, often alongside other neurological signs that usually build over time, although sudden decline is possible.
Metabolic or Toxic Encephalopathy
Disturbances affecting brain function from a cause outside the brain itself, such as a congenital liver shunt or exposure to a toxin, can also produce disorientation and circling, sometimes worse after eating or alongside other systemic signs. Signs from a congenital shunt are usually evident in young animals, although some show no signs until they are older.
Pain or Abdominal Disease
Pacing, restlessness and repeatedly getting up and lying down are recognised signs of pain in dogs, and are not specific to the nervous system or to behaviour. In dogs, restlessness with repeated retching that produces nothing, heavy drooling and a swelling abdomen is the typical early picture of gastric dilatation-volvulus (bloat), in which the stomach fills with gas and twists. It cannot be told apart from simple restlessness at home, and X-rays are needed to show whether the stomach has twisted. It is rapidly progressive and can be fatal within hours. Published mortality ranges from about 10 to 45% even with treatment, with surgical reports nearer 15%, and is higher once signs have lasted more than six hours. Treatment involves stabilisation, release of the gas and surgery.
Why timing matters
Early observation
A sudden onset of circling, especially with unsteadiness or a head tilt, usually points towards an acute event affecting balance or ear structures, although sudden circling with dullness, head pressing or seizures reflects the brain itself being affected, and sudden pacing with unproductive retching or a swelling abdomen in a dog reflects the stomach, where the course runs over hours.
Later presentation
Circling or pacing that has built gradually over weeks or months more often reflects a chronic process, such as cognitive decline, a slowly enlarging structural change, or an established behavioural pattern.
The pace at which the behaviour developed, together with whether it is stable, worsening, or fluctuating, helps distinguish an idiopathic balance disturbance, which is usually most severe in the first 24 to 48 hours, typically begins to improve within about 72 hours and largely resolves over two to three weeks, sometimes leaving a lasting head tilt, from a progressive or entrenched pattern that is unlikely to resolve without characterisation. A balance disturbance that does not improve, or worsens, suggests a more serious cause. Telling an inner ear cause from a brain cause depends on a neurological examination; dullness, weakness on one side and vertical flicking of the eyes point to a brain origin.
Conditions commonly associated
Vestibular Disease
Disruption to the balance system commonly produces circling towards one side, often with a head tilt and unsteady gait.
Otitis Interna
Inner ear infection can affect the vestibular structures directly, producing circling that closely resembles idiopathic vestibular disease.
Otitis Media
Middle ear disease can extend to affect balance-related structures, contributing to circling alongside more typical ear signs.
Canine Cognitive Dysfunction
Spatial disorientation is a core feature of cognitive decline, and aimless pacing or wandering, sometimes with circling, can be part of the picture.
Compulsive Behaviour in Dogs
Repetitive circling can develop into a self-sustaining compulsive pattern, sometimes originating from an earlier stressor or discomfort.
Anxiety Disorders in Cats
Underlying anxiety can manifest as pacing or circling, particularly around identifiable triggers or changes in the household.
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Brain Tumours
A structural change within the brain can produce persistent circling, typically towards the affected side, as part of a progressive neurological picture.
Generalised Anxiety in Dogs
Generalised anxiety keeps an animal in a persistent state of heightened arousal, which can show as repetitive pacing or circling.
Portosystemic Shunt
A portosystemic shunt allows toxins normally cleared by the liver, such as ammonia, to bypass filtration and build up in the bloodstream, and once these reach the brain they disrupt normal neurological function, which can show as disorientation, aimless circling or pacing.
Feline Cognitive Dysfunction
Disorientation and altered activity are recognised features of cognitive decline in older cats, and pacing, particularly at night with yowling, is one of its more noticeable expressions.
Gastric Dilatation-Volvulus (GDV) in Dogs
A stomach that has filled with gas and twisted typically shows first as restlessness and pacing with unproductive retching, drooling and a swelling abdomen, and progresses over hours.
When to explore further
Circling that appears suddenly and consistently favours one direction, particularly alongside a head tilt or loss of balance, points towards the vestibular system rather than a behavioural origin.
Pacing that intensifies in the evening, alongside disrupted sleep or apparent disorientation in familiar surroundings, is a pattern more typical of cognitive change in an older animal.
Circling that is new in an animal with a long-standing history of ear discharge, head shaking, or recurrent ear infections may reflect extension of disease deeper into the ear.
Pacing or circling that appears tied to specific triggers, such as being left alone or during fireworks and thunderstorms, points towards an anxiety-related pattern rather than a primary neurological one.
Persistent circling that does not fit a recognisable trigger and continues to build over weeks, particularly with any change in appetite, coordination, or behaviour, may benefit from characterisation rather than observation alone.
Circling alongside dullness, head pressing, blindness, seizures or collapse points to the brain itself being affected, for example by hepatic encephalopathy from a liver shunt or liver failure, and in hepatic encephalopathy these signs can progress to coma.
Pacing with unproductive retching, drooling or a tight, swollen abdomen in a dog points to the stomach rather than the brain or behaviour, and is a pattern that can become fatal within hours.
Recording which direction the animal circles towards, how many episodes occur per day, and what time of day they cluster around builds a useful pattern over a short period. A video capturing the gait, head position, and any loss of balance during an episode adds detail that is easily missed when only recalled afterwards, and noting any recent change in hearing, appetite, or sleep alongside the circling helps place it in a broader context.
Last reviewed: 10 October 2026 · Dr Alastair Greenway MRCVS