Canine epilepsy

Symptoms an owner can spot at home

• Generalised tonic-clonic seizure—sudden collapse, paddling, jaw chomping, loss of consciousness, often with urination, defecation, or hypersalivation
• Focal seizure—abnormal facial twitching, repetitive chewing, lip-smacking, head tremor, sometimes hallucinatory fly-biting
• Pre-ictal ("aura") period—restlessness, attention-seeking, hiding, in the minutes to hours before
• Post-ictal period—confusion, blindness, pacing, ravenous hunger, sometimes lasting hours
• Cluster pattern—multiple seizures within 24 hours, or status epilepticus (a seizure lasting more than 5 minutes) which is a medical emergency

When to see a vet

• First-ever seizure in any dog—always investigate; not every seizure is idiopathic epilepsy
• A seizure that lasts more than 5 minutes—status epilepticus, emergency
• Two or more seizures within 24 hours—cluster seizures, same-day emergency
• Sudden change in seizure pattern, frequency, or character in an already-diagnosed dog

What it is

A seizure is a sudden, abnormal burst of electrical activity in the brain. Epilepsy is the disease of having recurrent seizures. Causes split into reactive (toxins, low blood sugar, electrolyte derangements), structural (tumour, inflammation, stroke, malformation), and idiopathic—the brain itself is the seizure focus, no structural lesion is found. Idiopathic epilepsy is the most common form in dogs aged roughly 1–6 years and has a strong genetic component in breeds like the Belgian Shepherd, Border Collie, Labrador Retriever, and Beagle.

The International Veterinary Epilepsy Task Force (IVETF) published a tiered diagnostic and treatment framework in 2015 that is now the global clinical reference, including a confidence-level classification (Tier I clinical, Tier II adds MRI and CSF) and an evidence-based treatment hierarchy.

How vets diagnose it

Diagnosis is by elimination. Initial workup is a full neurological exam, bloodwork, bile acids, and urinalysis to exclude reactive causes. A dog presenting between 6 months and 6 years with a normal exam between seizures meets the IVETF Tier I criteria for suspected idiopathic epilepsy. Tier II adds advanced imaging (MRI) and cerebrospinal fluid analysis, typically required when onset is outside the 6-month-to-6-year window or when neurological signs persist between seizures.

Treatment overview

Editorial overview only—your vet or neurologist builds the plan. Anti-seizure medication is started when the dog meets specific IVETF criteria—typically two or more seizures within six months, cluster seizures, status epilepticus, or severe post-ictal signs. Phenobarbital and imepitoin are the IVETF Level I evidence first-line monotherapies; potassium bromide is a common second-line add-on. Diet has a supporting role: a medium-chain triglyceride (MCT)-enriched diet has Level I evidence as an adjunct, reducing seizure frequency in a controlled trial. Owner seizure diaries and serial drug-level monitoring drive dose adjustments.

What buyers can do

• Keep a detailed seizure diary—date, time, duration, what the dog was doing, post-ictal length. This is the most useful input you can give your vet.
• Video any seizure you can. What looks like a seizure to an owner is sometimes something else; the recording resolves it.
• Move sharp furniture away from the seizing dog and place soft padding around them. Do not put hands near the mouth—dogs cannot swallow their tongues, but bite injuries are real.
• Discuss an MCT-enriched therapeutic diet with your vet as an adjunct, especially in poorly-controlled cases.
• Never miss a dose, and never stop anti-seizure medication abruptly—withdrawal seizures can be more severe than the original disease.