The Neurological Exam: What Your Vet Checks
Watched your vet poke and flip your dog and had no idea what they were testing? Here's what each neurological exam test actually means — and how it maps to…
Photo by Jan-Christopher Sierks on Unsplash
Understanding the neurological exam your vet performs is one of the most useful things you can do as an IVDD caregiver — because those findings aren’t just routine checks, they’re the map your vet is using to locate the injury and predict what comes next.
When Heidi went through her IVDD crisis, I sat across from the exam table watching the vet flip her paws, squeeze her toes, and run a finger along her side — and I had absolutely no idea what any of it meant. I nodded along like I understood. I didn’t. It wasn’t until much later that I pieced together what each test was actually checking, and suddenly everything — the grading, the prognosis conversation, the surgery recommendation — made more sense. If you’re in that position right now, this article is for you.
What Is a Neurological Exam, and Why Does It Matter for IVDD?
A neurological exam is a structured series of physical tests that assess how well different parts of your dog’s nervous system are communicating. For IVDD specifically, it tells your vet two critical things: how much the spinal cord is affected, and approximately where along the spine the compression is occurring. Those two answers determine the IVDD grade and directly inform whether crate rest, medication, or surgery is the right path. As outlined by the American College of Veterinary Surgeons, neurological grading is central to making treatment decisions for intervertebral disc disease.
No imaging needed to start — the neurological exam is done by hand, in the room, in about ten minutes. It’s the first diagnostic layer.
The Four Core Tests (and What They’re Really Checking)
Proprioception: The Knuckling Test
Proprioception is your dog’s ability to sense where their own limbs are in space. The test is simple: the vet gently folds one of your dog’s paws so the top of the foot faces the floor (the knuckled position), then waits to see how quickly your dog flips it back to normal.
A dog with intact proprioception corrects the paw almost instantly — within one or two seconds. A dog with compromised spinal cord function may leave the paw knuckled, correct it very slowly, or not correct it at all.
Why this matters for IVDD: proprioceptive deficits appear early in spinal cord compression, often before obvious weakness sets in. If your dog knuckles on walks — stepping on the top of their paw instead of the pad — that’s proprioception failing in real life. The vet’s version of the test is just a controlled version of what you may have already noticed at home.
- Normal result: Paw flips back immediately. Spinal cord communication is intact or minimally affected.
- Delayed correction: Spinal cord is under pressure. Likely Grade 2 territory.
- No correction: Significant spinal cord involvement. Grade 3 or higher, depending on other findings.
Withdrawal Reflex: Testing the Spinal Reflex Arc
The withdrawal reflex tests whether a dog will pull its leg back when a toe is lightly pinched. This is a spinal reflex — it doesn’t require brain involvement, just an intact reflex arc at the local spinal cord level.
This matters because it helps your vet distinguish between a problem in the spinal cord itself versus a problem in the peripheral nerves (the nerves that run from the spinal cord out to the limbs). If the withdrawal reflex is absent, the injury is likely in the lower spinal cord or nerve roots. If it’s exaggerated, the problem is higher up in the cord.
- Normal result: Dog pulls leg back briskly. Local reflex arc is intact.
- Absent reflex: Lower motor neuron damage — the injury is at the reflex level or in the nerve roots.
- Exaggerated reflex: Upper motor neuron damage — compression is above the reflex arc. Common in thoracolumbar IVDD.
Panniculus Reflex: Mapping the Injury Location
This is the test where the vet runs a finger, pen cap, or hemostat lightly along the skin on either side of your dog’s spine, starting from the lower back and working upward. A dog with an intact panniculus reflex (also called the cutaneous trunci reflex) will twitch the skin of their back in response — like they’re trying to shake off a fly.
What your vet is actually doing: finding the point where the skin-twitch response disappears. The panniculus reflex is carried by a nerve that exits the spinal cord at a specific level. When the reflex cuts out, it tells the vet approximately which spinal cord segment is compressed.
This is how your vet narrows down the location of the disc herniation without imaging. It’s surprisingly precise — the cutoff point typically corresponds to one or two vertebrae near the injury.
- Normal result: Skin twitches consistently along the back.
- Cutoff point detected: Loss of reflex identifies the approximate spinal cord segment affected — valuable for targeting imaging and surgical planning.
Deep Pain Sensation: The Most Important Test
Deep pain sensation is the test that carries the most weight for prognosis. I’ve written about it separately in the deep pain sensation article, but here’s how it fits into the full exam.
The vet uses a hemostat (a surgical clamp) to apply firm pressure to the bone of a toe — not just the soft tissue, but the periosteum (bone covering). This is a stronger stimulus than the withdrawal reflex test. A dog who feels it will respond with a conscious reaction: turning to look, yelping, or trying to move away. Pulling the leg back alone doesn’t count — that can be a reflex. The vet is looking for a conscious, brain-mediated response.
- Loss of deep pain sensation means Grade 5 IVDD — the most severe classification
- Surgery is strongly recommended when deep pain is absent, and timing matters: outcomes are significantly better the sooner surgery is performed after loss of deep pain
- Even with surgery, recovery is not guaranteed — but without it, the odds drop sharply
- If your dog has lost deep pain, treat this as an emergency and contact a veterinary neurologist or surgeon immediately
- Normal result: Dog consciously reacts to the stimulus. Deep pain is intact. Recovery odds are substantially better.
- Absent result: No conscious response. Spinal cord compression is severe enough to have blocked the pain pathways entirely. Grade 5.
How Do These Tests Map to IVDD Grades?
The five IVDD grades aren’t arbitrary categories — they’re directly tied to what the neurological exam reveals. Here’s how the findings connect:
| IVDD Grade | Key Neurological Findings |
|---|---|
| Grade 1 | Pain only. Normal proprioception, normal reflexes, normal deep pain. |
| Grade 2 | Weakness (paresis) in hind limbs. Proprioception delayed or absent. Reflexes intact. Dog still walking. |
| Grade 3 | Non-ambulatory paresis. Dog cannot walk but retains some voluntary movement. Reflexes may be exaggerated. |
| Grade 4 | Paralysis. No voluntary movement. Reflexes present or exaggerated. Deep pain intact. |
| Grade 5 | Paralysis plus loss of deep pain sensation. Most severe. Emergency. |
disableddogcare.comFor a full breakdown of what each grade means for recovery odds and treatment decisions, IVDD Stages 1–5: Symptoms, Recovery Odds by Stage is the place to go.
- IVDD can change direction quickly — improvement or decline can appear within hours
- Repeat exams track whether proprioception is returning, reflexes are normalizing, or new deficits are appearing
- A change between visits — especially a new deficit — often triggers the decision to pursue imaging or surgery
- Consistent improvement across multiple exams is one of the best indicators that conservative management is working
What Happens After the Neurological Exam?
If the neurological exam reveals Grade 1 or mild Grade 2 findings, your vet will likely recommend strict crate rest and medication — typically a combination of anti-inflammatory medication and pain management — before any imaging is pursued. If findings are Grade 3 or higher, or if the dog is deteriorating quickly, your vet will almost certainly recommend imaging (MRI is the gold standard for IVDD) and a consultation with a veterinary neurologist or surgeon.
- Which specific tests did my dog pass or fail, and what does that mean for their grade?
- Is there any sign of improvement or decline compared to the last visit?
- At what point would you recommend imaging or a neurologist referral?
- What signs at home should prompt me to call you immediately?
For a complete picture of what the broader appointment involves — the intake, the history questions, and how neurologists think through a case — the IVDD neurologist visit article covers the logistics side in detail.
Related Reading
- Your Dog’s IVDD Neurologist Visit: What Actually Happens
- Deep Pain Sensation in Dogs: Why It Decides the Prognosis
- IVDD Stages 1–5: Symptoms, Recovery Odds by Stage
Frequently Asked Questions
What does it mean if my dog fails the proprioception test?
Failing the proprioception test — meaning your dog doesn’t flip its paw back to normal position — indicates disrupted communication between the spinal cord and the brain. It’s one of the earliest signs of spinal cord involvement in IVDD and typically places a dog at Grade 2 or higher on the IVDD scale.
Is the deep pain test painful for my dog?
The deep pain test involves a firm squeeze or clamping of the bone or toe with a hemostat, which sounds worse than it is. A dog with intact deep pain sensation will react (pulling away, turning to look, vocalizing) — that reaction is actually the good sign. Dogs who don’t react may not be feeling the stimulus at all, which is the concerning outcome.
Can a dog pass the neurological exam and still have IVDD?
Yes. Mild IVDD (Grade 1) often shows up as pain and muscle spasm with completely normal reflexes and proprioception. A dog can have a herniated disc causing significant pain but still pass every reflex test. The neurological exam tells your vet how much the spinal cord itself is affected — not just whether the disc is injured.
Why does my vet repeat the neurological exam at every visit?
IVDD can change — in either direction — quickly. Repeating the exam at each visit tracks whether the spinal cord is recovering (reflexes returning, proprioception improving) or declining (new deficits appearing). A change between visits often drives the decision to escalate to imaging or surgery.
This guide is based on real experience and should be used alongside professional veterinary care. Always consult your veterinarian before starting any new treatment or making changes to your dog’s care plan.