Disease Guide ·Episodic Falling Syndrome ·2026

Episodic Falling Syndrome in Dogs — symptoms, vet costs & insurance

Episodic falling syndrome diagnosis costs $300-$700, with medications running $30-$80/month. This inherited neurological condition causes episodes of increased muscle tone (hypertonicity) triggered by exercise, excitement, or stress. The dog remains fully conscious during episodes but can't control its muscles. It primarily affects Cavalier King Charles Spaniels.

By Marcel Janik · Reviewed by veterinary data
Episodic Falling Syndrome — vet costs and insurance
Episodic Falling Syndrome — real vet costs and insurance guide.
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Key Facts & Real Vet Costs

What Is Episodic Falling Syndrome

Episodic falling syndrome (EFS) is a paroxysmal exercise-induced hypertonicity disorder. During an episode, muscles become progressively rigid — the dog's legs stiffen, its back arches, and it falls to the side unable to move. Episodes last seconds to minutes. The dog stays fully conscious throughout, which distinguishes EFS from seizures. It's caused by a mutation in the BCAN gene, inherited as autosomal recessive. A genetic muscle disorder primarily affecting Cavalier King Charles Spaniels

Symptoms — What to Watch For

Stiffening of the legs during exercise or excitement. "Bunny hopping" gait — hind legs moving together. Arched back with rigid posture. Falling to one side, unable to get up. Deer-stalking posture with head held low. Episodes triggered by exercise, excitement, or stress. Dog remains conscious and aware throughout. Episodes are often mistaken for seizures

Diagnosis — $300-$700

DNA test ($50-$150) for the BCAN gene mutation is the definitive diagnostic. Video of episodes is extremely helpful for the neurologist. Neurological exam ($100-$200) to rule out epilepsy and other conditions. MRI ($1,500-$3,000) may be needed to exclude syringomyelia, which is also common in Cavaliers. Blood work ($100-$200) rules out metabolic causes. Average $300-$700 with genetic testing

Treatment — $30-$80/month

Clonazepam ($20-$50/month) is the primary medication — reduces episode frequency and severity. Diazepam can be used for acute episodes. Acetazolamide ($30-$60/month) as an alternative or add-on. Avoiding triggers: limit intense exercise, manage excitement levels. Some dogs improve with age. No cure exists, but management reduces episode frequency significantly. Average $30-$80/month

Total Cost — $500-$1,500/year

Daily medication plus periodic vet monitoring. Initial workup to rule out other conditions is the major upfront cost. $500-$1,500 annually for ongoing management.

Certain Breeds — Higher Risk

Cavalier King Charles Spaniels are the primary breed affected. English Cocker Spaniels, English Springer Spaniels, and Border Collies have reported similar conditions. Cavaliers carry the highest genetic risk.

Prognosis — Good with Management

EFS is not life-threatening and doesn't shorten lifespan. Episodes can be significantly reduced with medication. Some dogs improve naturally with age. Quality of life is generally good with proper trigger management and medication.

Prevention

DNA test breeding stock before mating. Both parents must carry the gene for offspring to be affected. Never breed two carriers together. Ask breeders for EFS genetic test results.

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The Real Cost

Daily medication plus periodic vet monitoring.

Diagnosis$300-$700 Treatment$30-$80/month Total Cost$500-$1,500/year
$500typical per year
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Insurance Traps A genetic condition — hereditary coverage is the key factor.
Red flag · Exclusion

Hereditary & Genetic Coverage

EFS is a well-documented genetic condition caused by a known gene mutation. Your policy must cover hereditary and genetic conditions for any claim to be accepted. Some policies specifically exclude genetic conditions or have breed-specific exclusions that may affect Cavalier owners.

Red flag · Pre-existing

The Misdiagnosis Risk

EFS episodes are frequently misdiagnosed as seizures or epilepsy. If your vet documents seizure activity before enrollment, an insurer may classify any neurological condition as pre-existing. Get an accurate diagnosis with the DNA test and video documentation before the condition is charted incorrectly.

Red flag · Chronic condition

Chronic Medication Value

At $500-$1,500/year for medication and monitoring over a lifetime, insurance provides consistent annual value. The initial diagnostic workup ($300-$700) is also covered under most illness provisions. Total lifetime management costs accumulate to $5,000-$15,000.

Red flag · Exclusion

MRI Exclusion Workup

Because Cavaliers are also prone to syringomyelia, an MRI ($1,500-$3,000) may be recommended to rule it out. This single diagnostic test can exceed a year of premiums. Confirm your policy covers advanced imaging as part of the diagnostic process.

Episodic Falling Syndrome and pet insurance guide

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Our guide shows exactly what to check in the fine print — before your first claim gets denied.

Insurance Guide
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Common Questions Real answers about costs, treatment, and insurance coverage.
0What is episodic falling syndrome?
Episodic falling syndrome (EFS) is a genetic neurological condition that causes episodes of exercise-induced muscle hypertonicity — essentially, the muscles lock up and become rigid. During an episode, the dog's legs stiffen, back arches, and it falls to the side unable to move normally. Unlike seizures, the dog remains fully conscious and aware throughout the entire episode. Episodes are triggered by exercise, excitement, or stress and typically last seconds to minutes. It's caused by a mutation in the BCAN (brevican) gene and is inherited as autosomal recessive.
1How is episodic falling syndrome different from seizures?
The critical difference is consciousness — dogs with EFS are fully alert and aware during episodes, while dogs having seizures typically lose consciousness or have altered awareness. EFS episodes are triggered by exercise or excitement and involve muscle stiffness (hypertonicity), while seizures can occur at any time and involve involuntary muscle contractions. In EFS, there's no post-ictal phase (the confusion and disorientation that follows seizures). Video documentation of episodes is essential for your vet to distinguish between the two conditions.
2How is episodic falling syndrome diagnosed?
The most definitive diagnostic is the DNA test for the BCAN gene mutation — available through several laboratories for $50-$150. Video recordings of episodes are invaluable for the veterinary neurologist to observe the characteristic pattern. A neurological exam ($100-$200) assesses the dog's baseline function between episodes. Blood work rules out metabolic causes. MRI may be recommended ($1,500-$3,000) to rule out syringomyelia, another condition common in Cavaliers that can cause similar signs. Total diagnostic workup runs $300-$700.
3How much does episodic falling syndrome treatment cost?
Daily clonazepam medication costs $20-$50/month. Acetazolamide, used as an alternative or add-on, runs $30-$60/month. Regular veterinary monitoring adds $100-$300/year. Initial diagnostic workup including DNA testing costs $300-$700. If MRI is needed to rule out syringomyelia, add $1,500-$3,000. Annual management cost is typically $500-$1,500. Over a dog's lifetime, total management costs range from $5,000-$15,000 depending on episode frequency and medication needs.
4Can episodic falling syndrome be cured?
There is no cure for EFS — it's a genetic condition. However, it can be effectively managed with medication and lifestyle adjustments. Clonazepam significantly reduces the frequency and severity of episodes in most dogs. Avoiding triggers (intense exercise, high excitement, stress) helps prevent episodes. Some dogs naturally improve with age, experiencing fewer and less severe episodes as they mature. The condition is not progressive and doesn't worsen over time in most cases. Quality of life is generally good with proper management.
5Is episodic falling syndrome hereditary?
Yes — EFS is caused by a mutation in the BCAN gene and is inherited as autosomal recessive. This means a dog must inherit two copies of the mutated gene (one from each parent) to be affected. Dogs with one copy are carriers — clinically normal but can pass the gene to offspring. A DNA test can identify affected dogs, carriers, and clear dogs. Responsible breeders test for EFS before breeding and never breed two carriers together. The test is widely available and relatively inexpensive at $50-$150.
6What triggers episodic falling syndrome episodes?
Exercise is the primary trigger — running, playing fetch, or any sustained physical activity. Excitement (visitors arriving, seeing other dogs, anticipation of walks) can trigger episodes. Stress and anxiety are also triggers. Hot weather can lower the threshold for episodes. The intensity and duration of the trigger often correlates with episode severity. Short, calm walks are usually well-tolerated. Learning your dog's specific trigger threshold allows you to manage activity levels and prevent most episodes.
7Does pet insurance cover episodic falling syndrome?
Coverage depends entirely on your policy's hereditary and genetic condition terms. EFS is a known genetic condition with an identified gene mutation — policies that exclude hereditary conditions won't cover it. If enrolled before any episodes are documented, comprehensive policies should cover diagnosis and ongoing medication. At $500-$1,500/year for management, plus potential MRI costs of $1,500-$3,000, insurance is valuable for Cavalier King Charles Spaniel owners. Enroll early, before any neurological symptoms appear in vet records.

Breeds Most Affected by Episodic Falling Syndrome

Cavalier King Charles Spaniel Related
Cavalier King Charles Spaniel
Cavalier King Charles Spaniel
English Cocker Spaniel Related
English Cocker Spaniel
English Cocker Spaniel
English Springer Spaniel Related
English Springer Spaniel
English Springer Spaniel

Sources

  1. Gill JL, Tsai KL, Krey C, et al. A canine BCAN microdeletion associated with episodic falling syndrome. Neurobiol Dis. 2011;45(1):130–136.
  2. Bhatti SF, Vanhaesebrouck AE, Van Soens I, et al. Myopathy associated with muscle hypertonicity in the Cavalier King Charles Spaniel. J Small Anim Pract. 2011;52(2):105–110.
  3. Herrtage ME, Palmer AC. Episodic falling in the cavalier King Charles spaniel. Vet Rec. 1983;112(19):458–459.
Marcel Janik, founder of RealVetCost

I’m a dog owner who got burned

My mother-in-law took her German boxer to the veterinary emergency room — $1,200 in tests, no answers. A different vet solved it in minutes with $8 pills.

That moment stuck with me. When you’re scared for your dog, you’ll pay anything. Some vets take advantage of that. I started digging into vet costs and pet insurance. The policies were confusing, the exclusions buried, the pricing impossible to compare. So I built the resource I wish existed. Real costs, real exclusions, plain speak. I’m not here to sell you a policy. I’m here so you don’t get blindsided.

Marcel Janik Senior UX/UI designer