Neurological Examination in Dogs: A Practical Guide

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-11

Key Takeaways

• The neurological examination systematically localizes lesions by assessing mentation, posture, gait, cranial nerves, postural reactions, and spinal reflexes, answering whether the problem is neurological, where the lesion is, and its likely pathophysiology.
• Differentiating upper motor neuron (UMN) from lower motor neuron (LMN) signs is critical: UMN lesions cause spastic paresis and hyperreflexia, while LMN lesions result in flaccid paresis, hyporeflexia/areflexia, and rapid muscle atrophy.
• Cranial nerve deficits, particularly asymmetric ones, localize to the brainstem or peripheral nerves, with specific tests like the menace response (CN II), pupillary light reflex (CN II, III), and gag reflex (CN IX, X) providing crucial diagnostic information.
• Postural reaction tests, such as proprioceptive placing and hopping, are highly sensitive for detecting subtle paresis and localize lesions to the sensorimotor pathway, while spinal reflexes pinpoint LMN deficits to specific spinal cord segments.
• The cutaneous trunci reflex is a valuable localizing tool for spinal cord lesions, with a loss of reflex caudal to a stimulus indicating a lesion cranial to that point, and spinal hyperaesthesia on palpation suggests vertebral or intervertebral disc pathology.
• Common errors include testing reflexes before establishing rapport, misinterpreting orthopedic pain as neurological weakness, and omitting sacral segment assessment; careful documentation and serial examinations are essential for accurate diagnosis and prognosis.

The neurological examination is a systematic, repeatable assessment that localizes lesions within the nervous system and generates a differential diagnosis ranked by likelihood. This guide provides a step-by-step framework for performing the examination in dogs, from the observational phase through cranial nerve testing, postural reactions, and spinal reflexes. It is written for veterinary students and general practitioners who need a reliable method for distinguishing neuroanatomical localization from diffuse or multifocal disease.

The examination answers three sequential questions. First, is the problem neurological? Second, where is the lesion? Third, what is the likely pathophysiology? The first question is answered by the history and physical examination, the second by the neurological examination itself, and the third by combining localization with signalment, onset, and progression. A complete examination takes 10 to 15 minutes in a cooperative dog and longer in a fearful or painful patient. The order matters: observe before you handle, and test the least threatening maneuves before the most aversive ones.

At a Glance

Neuroanatomical Basis of the Examination

The nervous system is organized into functional units that produce predictable deficits when damaged. The examination is designed to test each unit in isolation. The forebrain, comprising the cerebrum and thalamus, governs mentation, behavior, and voluntary motor planning. The brainstem contains the cranial nerve nuclei, ascending and descending tracts, and the reticular activating system. The cerebellum coordinates movement and maintains posture and balance. The spinal cord carries sensory information cranially and motor commands caudally, with the upper motor neuron (UMN) system originating in the brain and descending to synapse on lower motor neurons (LMNs) in the ventral horn or brainstem nuclei.

The distinction between UMN and LMN signs is the single most useful concept in neurological localization. An UMN lesion produces spastic paresis, normal to increased muscle tone, and normal to hyperreflexic spinal reflexes. An LMN lesion produces flaccid paresis, decreased muscle tone, hyporeflexia or areflexia, and rapid muscle atrophy. This distinction applies to both the limbs and the cranial nerves. A dog with an UMN lesion to the thoracic limb, for example, will have normal withdrawal reflexes but may show delayed proprioceptive placing. A dog with an LMN lesion to the same limb will have a weak or absent withdrawal reflex and reduced muscle tone.

The examination also relies on the principle of asymmetry. Most neurological disease in dogs is asymmetric, and comparing left with right, or thoracic with pelvic limbs, is more informative than comparing the patient with a textbook normal. Subtle deficits such as a delayed hopping response or a slightly reduced menace response may be the only abnormality in early disease. The examiner must therefore perform each test with the same technique on both sides and interpret differences with caution.

Preparation and Restraint

The examination begins before the dog is touched. Observe the dog in the examination room while it is free to move. Note mentation, posture, gait, and any abnormal movements such as tremors, circling, or head pressing. This observational phase is often the most informative part of the entire examination, and it cannot be repeated once the dog is restrained.

Restraint should be minimal but sufficient for safety. A fearful dog will mask neurological deficits by refusing to move or by moving stiffly. A painful dog may resent handling and resist postural testing. The examiner should have a plan for each test and perform it once, correctly, instead of repeatedly and incorrectly. Sedation is contraindicated before the neurological examination because it alters mentation, reflexes, and postural responses. If sedation is required for patient safety, the examination should be interpreted with that limitation in mind.

The physical examination should be completed before the neurological examination, particularly in trauma patients. Cardiovascular and respiratory instability must be addressed first, as neurological assessment is unreliable in a hypovolemic or hypoxic patient. This prioritization is emphasized in guidance on acute spinal cord injury, where concurrent injuries are common and life-threatening problems take precedence over detailed neurological testing. The same principle applies to pelvic trauma, where neurological deficits may be accompanied by urinary tract disruption and orthopedic injury that require immediate attention.

Observational Assessment

Mentation and Behavior

Mentation is graded on a continuum from alert to obtunded, stuporous, and comatose. An alert dog responds appropriately to its environment. An obtunded dog is depressed but responds to normal stimuli. A stuporous dog responds only to noxious stimuli. A comatose dog does not respond to any stimulus. The grade of mentation localizes the lesion: diffuse cortical disease produces obtundation, while stupor and coma indicate brainstem involvement, particularly of the reticular activating system.

Behavioral changes may accompany mentation changes. Circling, head pressing, pacing, and aimless wandering suggest forebrain disease. Aggression or loss of learned behaviors can also indicate cortical dysfunction. Behavioral problems can, however, arise from medical conditions that are not primarily neurological, including pain, endocrine disease, and cardiac disorders, so the neurological examination must be interpreted alongside the full clinical picture.

Posture and Gait

Postural abnormalities are noted before gait testing. A head tilt, with the top of the head tilted toward the side of the lesion, indicates vestibular disease. Pleurothotonus, a lateral curvature of the spine, can indicate a forebrain lesion with the dog turning toward the side of the lesion. Schiff-Sherrington posture, in which the thoracic limbs are extended and the pelvic limbs are paralysed, occurs with acute, severe thoracolumbar spinal cord lesions.

Gait is assessed at a walk and, if possible, at a trot. Observe each limb individually for stride length, joint flexion, and weight bearing. Paresis is weakness without loss of coordination. Ataxia is incoordination without weakness. Vestibular ataxia is characterized by a head tilt, circling, and falling to one side. Cerebellar ataxia is characterized by hypermetria, a goose-stepping gait, and intention tremors. Proprioceptive ataxia, from spinal cord disease, is characterized by a base-wide stance, knuckling, and crossing of the limbs. The gait pattern often localizes the lesion before any hands-on testing is performed.

Cranial Nerve Assessment

The cranial nerve examination is performed systematically from rostral to caudal. Each nerve is assessed bilaterally, and the examiner must distinguish deficits caused by dysfunction of the nerve itself from those caused by lesions in the brainstem nuclei or higher centers.

Olfactory and Optic Nerves (CN I, II)

Olfaction is rarely tested in conscious dogs due to poor patient cooperation. The optic nerve is assessed through the menace response, pupillary light reflex (PLR), and fundic examination. The menace response requires an intact visual pathway from retina to occipital cortex and a functional facial nerve for the blink. A dog with a cerebellar lesion may show a delayed or absent menace with normal vision, so the examiner should confirm vision independently using a maze test or cotton ball tracking before attributing a menace deficit to CN II pathology.

The PLR is assessed with a bright focal light source in a dimly lit room. The direct and consensual responses are compared. A complete oculomotor nerve lesion abolishes the ipsilateral direct and contralateral consensual PLR while preserving the ipsilateral consensual response from the opposite eye. An optic nerve lesion abolishes the direct response in the affected eye but preserves the consensual response when light is shone in the normal eye.

Oculomotor, Trochlear, and Abducens Nerves (CN III, IV, VI)

Strabismus, nystagmus, and pupillary abnormalities are assessed together. Physiologic nystagmus, the normal vestibulo-ocular reflex, is elicited by moving the head from side to side. Its absence indicates a lesion of the vestibular system, the medial longitudinal fasciculus, or the abducens and oculomotor nuclei. Pathologic nystagmus at rest is classified as horizontal, rotary, or vertical. Vertical nystagmus is strongly localizing to the brainstem.

A positional strabismus that appears only when the head is elevated suggests vestibular disease. A resting ventrolateral strabismus with mydriasis and absent PLR indicates CN III dysfunction. The examiner should note whether the strabismus is correctable by moving the head, which supports a vestibular origin, or fixed, which supports a neuromuscular or mechanical cause.

Trigeminal and Facial Nerves (CN V, VII)

The trigeminal nerve is assessed by testing facial sensation, masticatory muscle mass, and the palpebral reflex. The palpebral reflex tests the ophthalmic branch of CN V and the facial nerve. A dog with facial nerve paralysis will not blink but will withdraw the head when the nasal septum is stimulated, confirming intact trigeminal sensation. Masticatory muscle atrophy is assessed by palpating the temporalis and masseter muscles. Bilateral atrophy with dropped jaw suggests bilateral trigeminal motor dysfunction, seen in conditions such as masticatory myositis, which must be distinguished from trigeminal neuropathy.

The facial nerve is assessed by observing ear position, lip retraction, and the ability to close the eyelids. A subtle facial nerve paresis may be detected by observing asymmetric lip position at rest or by comparing the palpebral fissure widths. The examiner should also assess tear production if facial nerve dysfunction is suspected, as decreased lacrimation can lead to keratoconjunctivitis sicca.

Vestibulocochlear, Glossopharyngeal, Vagus, and Hypoglossal Nerves (CN VIII, IX, X, XII)

The vestibular component of CN VIII is assessed through the vestibular positioning responses, including the righting response, hopping with the head tilted, and the assessment of postural reactions with the head held in a fixed position. A head tilt, circling, and falling to one side localize to the ipsilateral vestibular system. The examiner must distinguish peripheral vestibular disease, which often presents with horizontal or rotary nystagmus and normal mentation, from central vestibular disease, which may show vertical nystagmus, postural reaction deficits, or other brainstem signs.

The gag reflex tests CN IX and X. A decreased gag reflex with laryngeal paralysis and regurgitation suggests dysfunction of these nerves. The hypoglossal nerve is assessed by observing tongue symmetry, tone, and the ability to retract the tongue. Tongue atrophy or deviation toward the side of the lesion indicates CN XII dysfunction.

Postural Reactions and Proprioception

Postural reaction testing evaluates the integrity of the ascending and descending pathways that maintain normal limb position. These tests are more sensitive than spinal reflex testing for detecting subtle deficits because they require integration across multiple spinal cord segments and the cerebrum.

Proprioceptive Positioning

The paw placement test is performed by knuckling the paw over and observing the speed and accuracy of correction. A delayed or absent correction indicates a lesion in the proprioceptive pathways. The test is performed on each limb, and the examiner should compare the response between limbs and between thoracic and pelvic limbs. A conscious proprioceptive deficit with normal spinal reflexes localizes the lesion to the upper motor neuron pathways or the cerebrum.

Hopping, Hemistanding, and Hemiwalking

Hopping is performed by supporting the dog with one limb on the ground and moving the body laterally. The dog should hop on the weight-bearing limb to maintain balance. A delayed or absent hopping response indicates a lesion in the proprioceptive or motor pathways. Hemistanding and hemiwalking are performed by lifting the ipsilateral thoracic and pelvic limbs and observing the dog's ability to bear weight and walk on the remaining limbs. These tests are particularly useful for detecting subtle asymmetries in dogs with suspected intracranial or cervical spinal cord lesions.

The examiner should perform postural reaction testing before spinal reflex testing, as the latter can be influenced by the dog's voluntary movement and anxiety. A dog that is reluctant to hop due to pain or orthopedic disease may show a false-positive deficit. The examiner should therefore correlate postural reaction findings with the gait assessment and orthopedic examination.

Spinal Reflexes

Spinal reflex testing evaluates the integrity of the reflex arc at specific spinal cord segments. The reflexes are graded as absent, reduced, normal, or exaggerated. A reduced or absent reflex indicates a lower motor neuron (LMN) lesion at the corresponding spinal cord segment. An exaggerated reflex indicates an upper motor neuron (UMN) lesion cranial to the reflex arc.

The patellar reflex is the most reliable spinal reflex in dogs because it is a monosynaptic stretch reflex. The withdrawal reflex is polysynaptic and requires a noxious stimulus. The examiner should apply firm pressure to the digits to elicit a consistent response. The crossed extensor reflex, extension of the contralateral limb during withdrawal testing, indicates a UMN lesion and is abnormal in dogs.

The perineal reflex is assessed by stimulating the perineal skin and observing anal sphincter contraction and tail flexion. A reduced perineal reflex with urinary incontinence and a distended bladder localizes the lesion to the sacral spinal cord segments or the cauda equina. This distinction is important because sacral lesions may be compressive and surgically correctable, as described in the management of pelvic trauma cases where neurological damage can involve the cauda equina Meeson and Corr, management of pelvic trauma.

Localizing the Lesion

The neurological examination findings are integrated to localize the lesion to one of five neuroanatomical regions: the cerebrum, brainstem, cerebellum, spinal cord segments, or peripheral nerves and neuromuscular junction.

The cutaneous trunci reflex is a valuable localizing tool for thoracic and lumbar spinal cord lesions. The reflex is elicited by pinching the skin along the dorsum and observing the ipsilateral cutaneous trunci muscle contraction. The reflex arc enters the spinal cord at the level of the stimulus and ascends in the fasciculus proprius to the C8-T1 segments. A lesion cranial to the stimulus site abolishes the reflex caudal to the lesion. The examiner can therefore map the cranial border of a spinal cord lesion by moving the stimulus cranially until the reflex is lost.

The examiner should also assess spinal hyperaesthesia by palpating the vertebral column and applying firm pressure over each vertebral body. Pain on palpation may indicate discospondylitis, vertebral fracture, or intervertebral disc disease. The presence of spinal pain with neurological deficits narrows the differential list and guides imaging decisions. In cats with acute spinal cord injury, the possibility of multiple sites of injury and concurrent trauma makes the neurological examination particularly challenging, and the examiner must prioritize life-threatening problems before completing the full neurological assessment Eminaga et al, acute spinal cord injury in the cat.

Documentation and Examination Checklist

The neurological examination findings should be recorded systematically using a standardized form. Each finding is graded and described with specific terminology. The examiner records the following:

• Mentation: alert, depressed, obtunded, stuporous, comatose
• Posture: normal, head tilt, head turn, wide-based stance, plantigrade stance
• Gait: normal, ataxic, paretic, paralytic, circling, hypermetric
• Cranial nerves: each nerve graded as normal or abnormal with specific description
• Postural reactions: each limb graded as normal, delayed, or absent
• Spinal reflexes: each reflex graded as absent, reduced, normal, or exaggerated
• Spinal palpation: presence or absence of pain, with location
• Bladder function: ability to void, bladder tone, and residual volume

A standardized checklist ensures that no component of the examination is omitted and provides a baseline for serial assessments. The examiner should record the time of the examination and the dog's signalment, as these factors influence interpretation. Serial examinations are often more informative than a single assessment, particularly in dogs with progressive or improving neurological disease. The examiner should repeat the examination at intervals appropriate to the suspected condition and document any changes in the neurological status.

The examination findings are used to formulate a neuroanatomical localization, which in turn guides the differential diagnosis and diagnostic plan. The localization is the single most important outcome of the neurological examination because it determines which imaging studies, cerebrospinal fluid analysis, or electrodiagn

Recognized Complications and Failure Modes

The neurological examination is vulnerable to misinterpretation when concurrent disease or physiological states alter responses. Spinal shock, a transient loss of spinal reflex activity caudal to an acute lesion, can produce depressed or absent pelvic limb reflexes in the immediate post-injury period, mimicking a lower motor neuron (LMN) lesion. Repeating the reflex assessment after 24 to 48 hours often reveals the true upper motor neuron (UMN) pattern. Similarly, musculoskeletal injury can obscure gait assessment and postural reactions. A dog with a fractured pelvis or limb will resist weight bearing and may appear paretic when the deficit is orthopedic. The management of pelvic trauma literature emphasizes that neurological and orthopedic injuries frequently coexist after road traffic accidents, so a thorough orthopedic examination must accompany the neurological assessment before localization is attempted.

Pain perception testing carries its own failure modes. Withdrawal reflexes are mediated segmentally and can persist despite complete spinal cord transection, so a dog that withdraws the limb in response to a toe pinch has not demonstrated conscious perception. Only a behavioral response such as turning the head, vocalising, or attempting to bite confirms intact nociception. Conversely, autonomic responses such as tachycardia or pupil dilation occur in the absence of conscious perception and must not be recorded as positive. In deeply obtunded patients, withdrawal may be a spinal reflex and should be documented separately from conscious pain perception.

Common Errors and Corrective Actions

Students and less experienced clinicians most often err by testing reflexes before establishing rapport with the patient. A tense or fearful dog will resist manipulation, and the resulting voluntary muscle activity obscures reflex assessment. The RCVS Day One Competences require graduates to handle patients with due regard for their welfare and to adapt examination technique accordingly. Allow the dog to settle, use minimal restraint, and repeat ambiguous tests instead of recording a single equivocal result.

A second frequent error is testing postural reactions in a dog that is not bearing weight symmetrically. Hopping on a painful limb is unreliable, and the clinician may misattribute a reduced response to a neurological lesion. Always correlate postural reaction deficits with the gait assessment and spinal reflex findings. A third error is failing to test each thoracic limb against its pelvic counterpart. Subtle hemiparesis is best detected by comparing left and right sides during hopping and hemiwalking, not by assessing each limb in isolation.

Finally, clinicians often omit the sacral segments. The perineal reflex and anal tone are easily overlooked, yet they are essential for localizing sacral or caudal lesions and for prognostication in pelvic trauma. Include them in every complete examination.

Limitations of the Evidence and Divergent Expert Opinion

The evidence base for the canine neurological examination rests largely on clinical experience and extrapolation from human neurology instead of on controlled trials. The review of medical conditions and behavioral problems in dogs and cats notes that the relationship between pain and behavioral change is not fully characterized, and the same uncertainty applies to subtle neurological deficits that may present as behavior change instead of obvious paresis. Expert opinion differs on the prognostic value of specific reflex patterns in acute spinal cord injury, particularly on how much weight to place on the presence of the panniculus reflex and on the timing of pain perception testing after injury. Some clinicians advocate repeated testing at short intervals, others prefer a single assessment to avoid stressing the patient. Both approaches are defensible, and the clinician should document the timing and conditions of each test.

Referral, Specialist Consultation, and Reporting

Referral to a specialist or neurologist is warranted when the lesion localizes to a region that requires advanced imaging, when the examination findings are ambiguous despite repeat assessment, or when the patient deteriorates neurologically during observation. The acute spinal cord injury literature advises that referral should be considered when facilities for advanced imaging or surgery are unavailable, and that the decision should be made early instead of after prolonged conservative management. Laboratory involvement is indicated when systemic disease is suspected as the cause of neurological signs, since conditions such as hypertension or hepatic encephalopathy can produce multifocal deficits that mimic primary neurological disease. Regulatory reporting obligations vary by jurisdiction and by the suspected cause. Where a notifiable disease is suspected, the WOAH terrestrial animal health standards provide the international framework for notification, and local veterinary authorities should be consulted for region-specific requirements.

Frequently Asked Questions

How Do I Adapt the Neurological Examination When Advanced Imaging Is Unavailable?

The examination itself does not require imaging. Localization is a clinical skill based on neuroanatomical reasoning, and imaging confirms or refines the suspected lesion. When MRI or CT is unavailable, radiographs and myelography can identify vertebral fractures, luxations, and compressive lesions, though they do not assess spinal cord parenchymal integrity directly. Electrophysiology, cerebrospinal fluid analysis, and muscle or nerve biopsy remain available for neuromuscular disease work-up. The MSD Veterinary Manual provides guidance on these adjunctive tests. If imaging facilities or surgical expertise are lacking, referral to a specialist institution should be discussed with the owner once the neurological examination has established a working localization.

What Is the Minimum Equipment Set Required for a Reliable Examination?

A complete examination requires surprisingly little: a quiet room, a non-slip surface, a reflex hammer, and a bright light source. A cotton swab or blunt probe assesses nasal sensation and the corneal reflex. Hemostats test deep pain perception, but use them with care and only when voluntary motor function is absent. A smartphone camera records gait abnormalities for serial comparison. Absence of specialised equipment should not compromise the examination. The Royal College of Veterinary Surgeons day one competences expect graduates to perform a neurological examination using basic instruments. Prioritize the non-slip surface above all else, since proprioceptive testing on a slippery floor produces false-positive deficits.

How Should I Record Neurological Findings in the Medical Record?

Record findings at the time of examination, not from memory. Use a standardized checklist that includes mentation, posture, gait, each cranial nerve, postural reactions, and spinal reflexes. Describe what you observed, not your interpretation alone. For example, write "absent conscious proprioception, left pelvic limb" instead of "left pelvic limb weakness." Grade reflexes on a defined scale and record the scale in the notes. Include a body condition score and pain assessment, since medical conditions can alter behavior and confound neurological interpretation. Serial examinations are often more informative than a single assessment, so record the date and time of each examination and note any changes explicitly.

How Do I Differentiate Neurological Weakness from Orthopedic or Metabolic Disease?

Weakness from neuromuscular disease can mimic cardiovascular, pulmonary, or orthopedic disorders on initial inspection. Key discriminators include the presence of proprioceptive deficits, which point to neurological disease, and the distribution of weakness. A plantigrade stance in the pelvic limbs suggests peripheral neuropathy or myopathy. Pain localized to a joint or bone on palpation favours orthopedic disease. Systemic signs such as pyrexia, weight loss, or polyuria suggest metabolic or inflammatory disease with secondary neurological effects. The clinical approach to weakness in small animals emphasizes that a thorough physical examination must precede the neurological examination, because life-threatening systemic disease may otherwise be missed.

How Do I Examine a Recumbent or Non-Ambulatory Dog?

Recumbent dogs require a modified approach. Assess mentation and cranial nerves first, since these are unaffected by recumbency. Test postural reactions in lateral recumbency: place the paw in a knuckled position and observe correction. Hopping can be tested by supporting the dog and moving the limb individually. Spinal reflexes remain testable in recumbency and are essential for distinguishing upper motor neuron from lower motor neuron disease. Deep pain perception must be assessed in all four limbs in a non-ambulatory dog, particularly after trauma. Acute spinal cord injury assessment stresses that multiple sites of spinal injury and spinal shock can complicate interpretation, so repeat the examination after stabilization if findings are equivocal.

How Do I Explain the Examination Findings and Prognosis to the Owner?

Use clear, structured language. State the localization first, then the suspected disease process, then the recommended next steps. Avoid jargon or define each term as you use it. Explain that the neurological examination identifies where the problem is, not always what it is, and that imaging or other tests may be needed for a definitive diagnosis. Be honest about prognostic uncertainty, particularly in acute spinal cord injury where the evidence base for outcome prediction is limited. Discuss costs of advanced imaging and referral openly, and offer the option of a second opinion. Document the discussion in the record, including the owner's decisions and any financial constraints that influence the diagnostic plan.

Related Clinical & Scientific Guides

• Veterinary Case Presentation: Structure and Delivery
• Veterinary Communication in the Workplace: Team Dynamics
• Monitoring Plans for Hospitalized Veterinary Patients

References and Further Reading

• Management of pelvic trauma: neurological damage, urinary tract disruption and pelvic fractures.. 2011.
• Neuromuscular disorders in the cat: clinical approach to weakness.. 2011.
• Acute spinal cord injury in the cat: causes, treatment and prognosis.. 2011.
• The cat with neurological manifestations of systemic disease. Key conditions impacting on the CNS.. 2009.
• A Review of Medical Conditions and Behavioral Problems in Dogs and Cats.. 2019.
• Neuromodulation in a minipig MPTP model of Parkinson disease.. 2008.
• RCVS Day One Competences. RCVS.
• MSD Veterinary Manual, Professional Edition. MSD Veterinary Manual.
• American Veterinary Medical Association Practice Resources. American Veterinary Medical Association.

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This article is educational professional reference material for veterinary audiences. It is not a substitute for veterinary diagnosis, individual clinical judgment, current product labeling, or applicable regulatory requirements.