Dog Fitting: What to Do When Your Dog Has a Seizure
Dog fitting what to do: Learn the science behind canine seizures, how to keep your dog safe during an episode, and when to seek emergency veterinary care.
1. Stay calm and move furniture or hard objects away from your dog.
2. Do NOT put your hands near your dog's mouth — dogs cannot swallow their tongues.
3. Time the seizure from the moment rhythmic jerking begins.
4. Dim lights and reduce noise if possible.
5. After the seizure ends, keep your dog in a safe, padded area and offer water.
6. Call your veterinarian if the seizure lasts more than 3 minutes, if multiple seizures occur within 24 hours, or if this is your dog's first seizure.
Emergency? Call your nearest 24-hour veterinary hospital or ASPCA Animal Poison Control at (888) 426-4435 if you suspect toxin ingestion.
What Does 'Dog Fitting' Actually Mean?
The term "fitting" is a colloquial expression used primarily in British and Commonwealth English to describe a dog experiencing a seizure — a sudden, uncontrolled burst of electrical activity in the brain that manifests as involuntary muscle contractions, loss of consciousness, paddling leg movements, jaw chomping, drooling, and sometimes urination or defecation. In veterinary medicine, the clinical term is generalized tonic-clonic seizure (formerly called grand mal seizure).
Seizures in dogs are more common than many owners realize. According to data published in the Journal of Veterinary Internal Medicine, approximately 0.5% to 5.7% of all dogs will experience at least one seizure in their lifetime, with the wide range reflecting differences in breed predisposition and study populations. That means in a typical veterinary practice seeing 3,000 patients per year, somewhere between 15 and 170 of those dogs may present with seizure activity.
Understanding what happens neurologically during a seizure — and why some dogs are predisposed — helps owners respond calmly and make informed decisions about diagnosis, treatment, and long-term management.
The Neuroscience: How a Seizure Happens in the Canine Brain
The Excitation-Inhibition Imbalance
A healthy canine brain maintains a precise balance between excitatory neurotransmitters (primarily glutamate) and inhibitory neurotransmitters (primarily GABA — gamma-aminobutyric acid). Think of it like a car with both an accelerator and a brake: under normal conditions, the two systems keep neural firing within safe limits.
A seizure occurs when this balance tips dramatically toward excitation. A cluster of neurons begins firing abnormally and synchronously — essentially, a localized electrical storm. When this storm spreads across both hemispheres of the brain, it produces a generalized seizure with full-body involvement. When it remains localized, it produces a focal (partial) seizure that may look like facial twitching, fly-snapping behavior, or rhythmic blinking on one side.
The ictal phase (the seizure itself) typically lasts 30 seconds to 3 minutes. The post-ictal phase that follows can last minutes to hours and may involve disorientation, temporary blindness, excessive thirst, pacing, or even transient aggression. This recovery period occurs because neurons are metabolically exhausted after the massive electrical discharge and need time to restore their chemical balance.
Why the Post-Ictal Phase Is So Disorienting
During a seizure, the brain's glucose consumption spikes to 2-3 times its normal rate. Neurons deplete their glycogen stores, and the blood-brain barrier may become temporarily more permeable. The result is a brain that is functionally impaired — similar to a computer rebooting after a crash. Dogs in the post-ictal phase may not recognize their owners, may walk into walls, or may eat or drink ravenously. This is normal and usually resolves within 1-24 hours.
The Evolutionary Context: Why Seizure Susceptibility Persists in Dogs
Why hasn't natural selection eliminated seizure disorders?
Seizures are not a single disease — they are a symptom with dozens of possible causes. Many forms of epilepsy in dogs are idiopathic (cause unknown, presumed genetic), and the genes involved likely persisted in ancestral wolf populations because they served other beneficial functions or were simply not selected against in wild canids that rarely lived long enough to develop late-onset epilepsy.
Additionally, the neural architecture that makes the mammalian brain capable of complex learning, memory, and social behavior — dense interconnectivity, rapid synaptic plasticity, and glutamate-driven signaling — is the same architecture that creates vulnerability to runaway electrical discharge. In a sense, the canine brain's greatest strength (its adaptability and processing power) carries an inherent risk of electrical instability.
In wolves and wild canids, a seizure-prone individual would likely not survive long due to predation risk or inability to hunt. But in domestic dogs, protected environments and veterinary care allow these genetic traits to persist and become visible — particularly in purebred lines where selective breeding for physical and behavioral traits has inadvertently concentrated epilepsy-linked genes.
Breed Predispositions: Which Dogs Are Most at Risk?
While any dog can experience a seizure, certain breeds show significantly higher rates of idiopathic epilepsy. Research from the American Kennel Club's Canine Health Foundation and multiple peer-reviewed studies have identified the following breeds as having elevated risk:
| Breed | Estimated Prevalence | Typical Age of Onset | Notes |
|---|---|---|---|
| Belgian Tervuren | ~9-10% | 1-5 years | Among the highest breed-specific rates documented |
| Beagle | ~5-7% | 6 months-3 years | Well-studied model; likely polygenic inheritance |
| Australian Shepherd | ~4-6% | 1-5 years | May be linked to MDR1 gene mutation; drug sensitivity can complicate treatment |
| Border Collie | ~3-5% | 1-4 years | Often more severe and medication-resistant |
| Labrador Retriever | ~2-3% | 6 months-6 years | High absolute numbers due to breed popularity |
| German Shepherd | ~2-3% | 1-5 years | May present with cluster seizures |
| Golden Retriever | ~2-3% | 1-5 years | Also elevated risk for brain tumors in older dogs |
| Bernese Mountain Dog | ~2-4% | 1-5 years | Higher risk of symptomatic epilepsy from brain tumors |
Crossbreed and mixed-breed dogs are not immune, but they tend to show lower overall prevalence, likely due to hybrid vigor — the reduced concentration of breed-specific recessive genes. However, a mixed-breed dog with significant representation from any of the above breeds may still carry elevated risk.
Common Causes Beyond Genetics: The Diagnostic Picture
Not every seizure is epilepsy. When your dog presents with seizure activity, your veterinarian will systematically work through potential causes. According to the Merck Veterinary Manual, causes are typically categorized by the dog's age:
Puppies Under 6 Months
- Hypoglycemia (low blood sugar) — especially in toy breeds
- Portosystemic shunts (liver blood vessel abnormalities causing toxin buildup)
- Congenital brain malformations (hydrocephalus, lissencephaly)
- Infectious diseases (canine distemper, neosporosis)
- Toxin ingestion (chocolate, xylitol, rodenticides, certain plants)
Young Adults (6 Months to 6 Years)
- Idiopathic epilepsy (most common diagnosis in this age group after other causes are ruled out)
- Infectious/inflammatory (meningitis, encephalitis)
- Toxin exposure
- Traumatic brain injury
Senior Dogs (Over 6 Years)
- Brain tumors (meningiomas, gliomas — the most common new-onset cause in older dogs)
- Metabolic disease (kidney failure, liver failure, Cushing's disease)
- Cerebrovascular disease (strokes — less common in dogs than humans but documented)
- Hypothyroidism (severe, untreated)
Diagnostic Tests Your Veterinarian Will Likely Run
| Test | Purpose | Typical Cost Range (USD) |
|---|---|---|
| Complete Blood Count (CBC) | Infection, anemia, platelet disorders | $50-$100 |
| Serum Chemistry Panel | Liver/kidney function, glucose, electrolytes | $80-$180 |
| Bile Acids Test | Liver shunt or dysfunction screening | $100-$250 |
| Urinalysis | Kidney function, metabolic markers | $40-$80 |
| MRI (under general anesthesia) | Brain tumor, malformation, inflammation | $1,500-$3,500 |
| CSF Tap (cerebrospinal fluid analysis) | Infectious/inflammatory CNS disease | $300-$600 (added to MRI cost) |
Not every dog needs an MRI. If your dog is between 6 months and 6 years old, has a normal neurological exam between seizures, and bloodwork is unremarkable, your veterinarian may diagnose idiopathic epilepsy without advanced imaging — especially if the estimated cost of MRI is prohibitive. However, MRI is strongly recommended for dogs outside the typical age range, dogs with abnormal neurological exams, or dogs whose seizures are worsening or becoming medication-resistant.
Myth vs. Fact: Debunking Seizure Misconceptions
| Myth | Fact |
|---|---|
| "My dog will swallow their tongue during a seizure." | Anatomically impossible. The tongue is anchored by the genioglossus muscle to the mandible. Putting your hand in a seizing dog's mouth is how you get bitten — severely. Dogs have no voluntary muscle control during a tonic-clonic seizure and will clamp down with full jaw force. |
| "One seizure means my dog has epilepsy." | A single seizure can be caused by toxins, metabolic disturbances, fever, or head trauma. Idiopathic epilepsy is typically diagnosed only after recurrent, unprovoked seizures (at least two, separated by more than 24 hours) with no identifiable underlying cause. |
| "Seizures are always painful for dogs." | During a generalized seizure, the dog is unconscious and does not experience pain. The post-ictal phase may involve discomfort, confusion, and headache-like symptoms, but the seizure itself is not a painful experience for the dog. |
| "I should restrain my dog to stop the seizure." | Restraint does not stop a seizure and may cause injury to both you and your dog. The seizure will run its neurological course regardless of physical intervention. Your role is to keep the environment safe, not to physically stop the movements. |
| "If my dog is on medication, seizures will stop completely." | Anti-seizure medications reduce seizure frequency and severity. The realistic goal, per the ACVIM (American College of Veterinary Internal Medicine) consensus statement, is a ≥50% reduction in seizure frequency. Complete seizure freedom is achieved in roughly 15-30% of treated dogs, depending on the underlying cause. |
How Dogs Differ from Humans in Seizure Presentation
While the underlying neurophysiology of seizures is remarkably similar between dogs and humans, there are clinically important differences in how seizures present and are managed:
- Dogs rarely experience auras that owners can detect. Some dogs may seek their owner, appear anxious, or hide before a seizure (the "pre-ictal" phase), but the classic human aura — a conscious warning sensation — is difficult to confirm in canines.
- Cluster seizures are more common in dogs than in humans. A dog may have 2-5 seizures within a 24-hour period, and this pattern is particularly prevalent in Border Collies and German Shepherds. Cluster seizures are considered an emergency because they carry a higher risk of progressing to status epilepticus — a continuous seizure lasting more than 5 minutes that can cause permanent brain damage or death.
- Dogs metabolize anti-seizure medications faster. Phenobarbital, the most commonly prescribed first-line anti-seizure drug in dogs, has a half-life of roughly 40-70 hours in canines compared to 80-120 hours in humans. This is why dogs typically require twice-daily dosing and regular blood level monitoring (every 6-12 months, or whenever dosage changes).
- The emotional aftermath differs. Humans can articulate post-seizure confusion, headache, and muscle soreness. Dogs manifest distress behaviorally — pacing, whining, clinginess, or sometimes aggression. Owners often find the post-ictal phase more distressing to witness than the seizure itself.
Practical Takeaways: What This Means for Daily Life
Your Seizure Action Plan
Every owner of a seizure-prone dog should have a written plan posted in a visible location (refrigerator, phone notes). Share this with anyone who cares for your dog:
- Time it. Use your phone's stopwatch. Note the exact start time of rhythmic jerking (not the pre-ictal pacing or anxiety).
- Clear the area. Move coffee tables, chairs, and hard objects. Block access to stairs. If your dog is on a couch or bed, gently slide them to the floor using a blanket — do not lift a seizing dog.
- Reduce stimulation. Turn off lights, mute the TV, ask other people and pets to leave the room.
- Record if possible. A 30-second video of the seizure is enormously helpful for your veterinarian or veterinary neurologist. It helps distinguish true seizures from other paroxysmal events (syncope, vestibular episodes, tremor syndromes).
- Post-seizure care. Offer water. Keep the room quiet. Expect disorientation for 1-24 hours. Block access to stairs and pools until your dog is fully oriented.
- Log every event. Use a seizure diary or app (the Cluster Catcher app, developed by veterinary neurologists, is one option). Record date, time, duration, severity, and any potential triggers.
When to Go to the Emergency Vet Immediately
- A single seizure lasting more than 3-5 minutes
- Two or more seizures within a 24-hour period (cluster seizures)
- A seizure followed by a second seizure before your dog fully recovers consciousness
- Any seizure in a dog under 6 months or over 6 years of age (first occurrence)
- A seizure accompanied by known or suspected toxin ingestion
- A seizure in a diabetic dog (may indicate dangerous hypoglycemia)
Long-Term Management Costs to Budget For
If your dog is diagnosed with idiopathic epilepsy, plan for these ongoing expenses:
- Phenobarbital or potassium bromide: $15-$60/month depending on dog size and dose
- Levetiracetam (Keppra): $30-$120/month (often used as add-on therapy)
- Serum drug level monitoring: $80-$150 per test, recommended every 6-12 months
- Liver function monitoring (for phenobarbital patients): $80-$180 per panel, every 6-12 months
- Emergency visits for cluster seizures: $500-$2,500 per visit (includes injectable diazepam/midazolam, IV fluids, overnight monitoring)
- Neurology consultation + MRI: $2,000-$4,000 (one-time, if pursued)
Pet insurance can significantly offset these costs. Most comprehensive policies (e.g., Trupanion, Healthy Paws, Nationwide) cover hereditary epilepsy if enrolled before symptom onset — typically $40-$90/month in premiums. However, pre-existing condition exclusions are universal, so enrolling your puppy early is the most cost-effective strategy.
Related Behaviors and Conditions That Mimic Seizures
Not every episode of abnormal movement is a seizure. Several conditions can look similar enough to confuse even experienced owners:
- Syncope (fainting): Caused by a sudden drop in blood pressure or heart arrhythmia. The dog collapses, may have brief stiffening, but recovers within seconds to a minute with no post-ictal confusion. Common in Cavalier King Charles Spaniels and Boxers with cardiac disease.
- Idiopathic head tremor syndrome: Rhythmic "yes-yes" or "no-no" head bobbing, primarily in Bulldogs, Boxers, and Dobermans. The dog remains fully conscious and responsive. Episodes resolve spontaneously and are not treated with anti-seizure medication.
- Vestibular disease: Head tilt, circling, falling to one side, and rapid eye movements (nystagmus). Common in older dogs ("old dog vestibular syndrome"). Dramatic in appearance but often resolves within 1-3 weeks with supportive care.
- Rapid Eye Movement (REM) sleep behavior: Paddling, twitching, and soft vocalization during deep sleep. Completely normal — the dog is dreaming. A gentle touch or soft call of their name will wake them, unlike a seizure.
- Stereotypic (compulsive) behaviors: Repetitive fly-snapping, tail-chasing, or flank-sucking. These are behavioral, not neurological, though severe cases may benefit from behavioral medication consultation.
Frequently Asked Questions
Why do dogs have seizures?
Dogs have seizures when abnormal, synchronized electrical activity disrupts normal brain function. The underlying cause varies: in young adult dogs, it is most often idiopathic epilepsy (presumed genetic). In puppies, metabolic issues and congenital defects are common. In senior dogs, brain tumors and organ failure are leading causes. Toxins, infections, and head trauma can trigger seizures at any age.
Can dogs grow out of seizures?
Some puppies who experience seizures due to metabolic causes (such as portosystemic shunts or hypoglycemia) may become seizure-free once the underlying condition is treated. However, dogs diagnosed with idiopathic epilepsy typically require lifelong management. A small percentage of dogs (estimated 10-15%) may achieve remission — defined as seizure-free for over one year — and may eventually be tapered off medication under veterinary supervision. Never discontinue anti-seizure medication abruptly, as this can trigger status epilepticus.
How do dogs process seizures differently from humans?
The fundamental neurophysiology is the same — excessive synchronous neuronal firing. However, dogs have faster hepatic metabolism of anti-seizure drugs, are more prone to cluster seizure patterns, and cannot verbally report auras or post-seizure symptoms. Their shorter lifespan also means that late-onset seizures are more likely to signal a brain tumor than in a 30-year-old human with new-onset seizures.
What does it mean when my dog has a seizure while sleeping?
Seizures can occur during sleep because the brain's electrical patterns shift during sleep transitions, which can trigger abnormal discharge in predisposed dogs. Sleep-related seizures are not fundamentally different from waking seizures. However, make sure what you are witnessing is actually a seizure and not normal REM sleep movements. If you can wake your dog by calling their name and the movements stop, it is likely dreaming, not a seizure.
Is it normal for a dog to have just one seizure?
A single, isolated seizure — sometimes called a "provoked" or "reactive" seizure — can occur due to a transient cause such as toxin exposure, fever, or a metabolic disturbance. If your dog has one seizure, a thorough veterinary workup is still essential to rule out underlying disease. If no cause is found and no further seizures occur within 6-12 months, your veterinarian may consider it an isolated event. However, approximately 45-65% of dogs who have one unprovoked seizure will go on to have more, at which point the diagnosis shifts to epilepsy.
Can my dog's diet affect seizure frequency?
Emerging research suggests that medium-chain triglyceride (MCT) supplemented diets may reduce seizure frequency in some dogs with idiopathic epilepsy. A 2020 study published in the Journal of Veterinary Internal Medicine found that dogs fed a diet supplemented with MCT oil showed a significant reduction in seizure days compared to a control diet. Purina Pro Plan Veterinary Supplements NeuroCare is one commercially available option formulated with MCTs. Always discuss dietary changes with your veterinarian, especially since some anti-seizure medications are affected by dietary fat content.
This article is for educational purposes and does not replace professional veterinary advice. If your dog is experiencing seizures, consult your veterinarian or a board-certified veterinary neurologist (DACVIM-Neurology) for diagnosis and treatment tailored to your dog's specific needs. If you suspect toxin ingestion, contact the ASPCA Animal Poison Control Center at (888) 426-4435 (24/7, consultation fee applies) or the Pet Poison Helpline at (855) 764-7661.
Tom Renshaw
All our authors care for dogs every day — read more of their work on the authors page.
