Testing for neurological disorders in dogs starts with a hands-on physical exam by a veterinarian and may progress to advanced imaging, electrical nerve testing, spinal fluid analysis, or genetic screening depending on what the initial exam reveals. Most neurological workups follow a layered approach: the vet narrows down where the problem is in the nervous system first, then selects targeted diagnostics to identify the cause.
Before any of that happens, though, what you observe at home plays a surprisingly important role in guiding the entire process.
What to Watch for at Home
Your observations give the veterinarian critical clues that a brief office visit might not capture, especially if your dog’s symptoms come and go. Signs of damage to higher brain centers can include mental deterioration, constant pacing, seizures, depression, or circling in one direction. A persistent head tilt often points to a problem with the vestibular system (the brain’s balance center) or the cerebellum. Head bobbing, tremors, or other unusual head movements suggest cerebellar involvement specifically.
Gait changes are among the most common early signs. Watch for circling, weakness or full paralysis of any limb, stumbling, falling, rolling, or a general loss of coordination. Pain in the neck area or visible muscle wasting in the front legs can indicate an upper spinal cord injury. Recording video of these episodes on your phone is one of the most useful things you can do. A 30-second clip of your dog walking, circling, or having an episode gives the vet information that a verbal description alone cannot.
Note when symptoms started, whether they’re getting worse, and if anything seems to trigger them. This timeline helps the vet distinguish between sudden-onset conditions (like a stroke or disc herniation) and slowly progressive diseases (like degenerative myelopathy or a brain tumor).
The Neurological Exam
A veterinary neurological exam is systematic and hands-on. It typically takes 20 to 45 minutes, requires no sedation, and covers several distinct areas. The vet is essentially mapping the nervous system to pinpoint where the problem originates.
Posture and Gait
The vet first observes your dog standing and walking. A healthy dog stands upright with its head held straight. Specific abnormal postures tell the vet a great deal. Extension of all four limbs with the head arched backward usually signals a brainstem lesion, and these dogs typically have decreased consciousness. A similar posture with the front legs rigid but the hips flexed points to an acute cerebellar problem. If the front legs are extended but the back legs are paralyzed, that pattern is associated with a lesion in the thoracic or lumbar spinal segments.
Postural Reactions
These tests check whether your dog knows where its feet are in space, a function called proprioception. The vet may flip a paw so the top rests on the ground. A healthy dog immediately corrects this. Delayed correction or no response suggests nerve damage. Hopping and wheelbarrowing tests, where the vet supports part of the dog’s body and has it move on one or two legs, reveal subtle weakness that normal walking might hide.
For smaller dogs and cats, the vet may cover the animal’s eyes and move it toward the edge of a table. When a paw touches the table edge, a healthy animal immediately places the limb forward onto the surface. The vet compares left and right sides and front and back legs, looking for asymmetry.
Cranial Nerve Assessment
Twelve pairs of cranial nerves control functions in the head and face. The vet tests these individually. They’ll check whether the pupils respond to light, whether the dog blinks when the corner of the eye is touched, and whether it can track a moving object. Touching the back of the throat with a swab should trigger a gag reflex, testing the nerves that control swallowing. The tongue is inspected for wasting, asymmetry, or deviation to one side. Muscle loss in the upper shoulder area can indicate damage to the nerve that supplies the trapezius muscle. Each finding helps the vet build a map of which nerves are functioning normally and which are not.
Spinal Reflexes
The vet taps tendons and pinches toes to test reflexes in each limb. These reflexes bypass the brain entirely, traveling only through the spinal cord, so they reveal whether the spinal cord itself is intact at specific levels. Exaggerated reflexes suggest a problem above that spinal segment. Absent reflexes suggest the problem is at that segment or in the peripheral nerves leaving it.
Vets may assign a severity score using a grading system that ranges from 0 to 5. A score of 5 means the dog only has spinal pain but can walk normally. A score of 0 means complete paralysis with no ability to feel deep pain, which carries the most serious prognosis.
Advanced Imaging: MRI and CT
When the neurological exam points to a structural problem (a tumor, disc herniation, inflammation, or bleeding), your vet will likely recommend imaging. MRI is the gold standard for the brain and spinal cord because it produces highly detailed images of soft tissue. CT scans are faster and better at showing bone, so they’re sometimes preferred for skull fractures or vertebral problems.
Both require general anesthesia because the dog must remain completely still, sometimes for 30 to 60 minutes. The average all-in cost for a dog MRI, including anesthesia, is around $5,000, though this varies by region and facility. CT scans are generally less expensive. These scans are performed at specialty or referral hospitals, not at most general practice clinics, so you may need a referral to a veterinary neurologist.
Cerebrospinal Fluid Analysis
Cerebrospinal fluid (CSF) is the liquid that surrounds the brain and spinal cord. Analyzing a sample of it can reveal infections, inflammation, and certain cancers. The vet collects it with a needle while the dog is under anesthesia, usually from just below the base of the skull or from the lower back.
In a healthy dog, CSF contains no more than 5 white blood cells per microliter. Protein levels are normally below 0.25 grams per liter when collected from the base of the skull, or below 0.40 grams per liter from the lower back. Elevated cell counts suggest inflammation or infection. High protein with normal cell counts can point to compression from a tumor or disc. Specific cell types in the sample help distinguish between bacterial infections, viral encephalitis, autoimmune conditions like meningitis, and cancer that has spread to the nervous system.
CSF collection is often done at the same time as an MRI, since the dog is already under anesthesia.
Electrodiagnostic Testing
When the problem appears to involve peripheral nerves (the wiring outside the brain and spinal cord) or the connection between nerves and muscles, electrodiagnostic tests can identify the exact location and type of damage. These tests require sedation or anesthesia.
Electromyography (EMG) involves inserting thin needle electrodes into muscles to measure their electrical activity. The vet evaluates three phases: the electrical response when the needle is inserted, the resting activity in the muscle (healthy muscle at rest should be electrically silent), and the patterns produced during muscle contraction. Abnormal spontaneous activity at rest, for instance, indicates nerve damage or muscle disease.
Nerve conduction velocity testing is often performed alongside EMG. It measures how fast electrical signals travel through a nerve. Slow conduction speed points to damage of the nerve’s insulating layer, while reduced signal strength suggests nerve fiber loss. This test is particularly useful for diagnosing conditions like brachial plexus injuries from trauma, facial paralysis, and various forms of neuropathy.
A more specialized test called repetitive nerve stimulation checks whether the junction between nerve and muscle is functioning properly. It’s the primary diagnostic tool for myasthenia gravis, a condition where the immune system attacks the connection point between nerves and muscles, causing progressive weakness. Conditions like botulism and tetanus also produce characteristic patterns on these tests.
Genetic Testing
Some neurological disorders in dogs are hereditary, and DNA tests can identify carriers or affected dogs before symptoms ever appear. The most widely used is the test for degenerative myelopathy (DM), a progressive spinal cord disease that causes hind-leg weakness and eventually paralysis, similar to ALS in humans.
The Veterinary Genetics Laboratory at UC Davis offers a genetic test for the specific gene mutation associated with DM. This test is included in breed-specific health panels for boxers, bulldogs, Doberman pinschers, French bulldogs, and German shepherds, among others. A simple cheek swab sent by mail is all that’s needed. Results come back as clear, carrier, or at-risk. Dogs with two copies of the mutation are at risk of developing DM, though not all of them will.
Genetic tests exist for several other neurological conditions as well, including certain forms of epilepsy, cerebellar degeneration, and storage diseases (conditions where cells can’t break down certain substances, causing progressive brain damage). Your vet or a breed club can advise which tests are relevant for your dog’s breed.
How Vets Decide Which Tests to Run
Not every dog with neurological symptoms needs every test. The neurological exam is the decision tree. A dog with sudden hind-leg weakness and back pain will likely go straight to imaging to check for a disc herniation. A dog with slowly progressive weakness in multiple legs might get electrodiagnostic testing to evaluate peripheral nerve function. A young dog with seizures and no other abnormalities might start with bloodwork to rule out metabolic causes before moving to an MRI.
Cost and the dog’s overall health factor in as well. Anesthesia carries some risk, particularly for older dogs or those with heart conditions. A veterinary neurologist can help you weigh the diagnostic value of each test against its cost and risk, so you’re making informed decisions at each step rather than committing to the full battery at once.