What you need to know

The majority of veterinary epilepsy research — and most of the information available online — focuses on dogs. This is understandable: idiopathic epilepsy is significantly more common in dogs than in cats, and much of the foundational guideline work (ACVIM, IVETF) has been led by canine neurology. However, cats develop epilepsy too, and feline epilepsy has distinct features that make direct extrapolation from canine research inappropriate.

If your cat has been diagnosed with epilepsy, this guide explains what is specifically known about feline seizure disorders — and where the evidence is limited.

How common is epilepsy in cats?

Epilepsy is estimated to affect approximately 1–2% of cats in the general population, compared to estimates of 1–5% in dogs depending on the population studied. Cats are more likely than dogs to have an identifiable structural or metabolic cause for their seizures — meaning truly idiopathic epilepsy (no identifiable cause) is less common in cats.

Causes of seizures in cats

Because idiopathic epilepsy is less common in cats, thorough investigation is more important when a cat presents with seizures. Common causes include:

• Structural epilepsy — Brain tumors, inflammatory brain disease (meningoencephalitis), FIP (feline infectious peritonitis) affecting the brain, and ischemic brain disease (brain strokes) are common structural causes in cats
• Metabolic/reactive causes — Hyperthyroidism (very common in older cats), chronic kidney disease, liver disease, and hypoglycemia
• Toxin-related — Permethrin toxicity (from dog flea products) is a particularly important cause of acute seizures in cats
• Idiopathic epilepsy — Present but less common; tends to present in younger cats without an identified cause after thorough investigation

How feline seizures look different

Cats may present with seizure types that differ from the classic tonic-clonic convulsions more commonly seen in dogs. Focal seizures — affecting only part of the body or causing behavioral changes without full convulsion — are relatively common in cats. Signs that may represent focal seizures in cats include:

• Sudden behavioral changes — aggression, fear, disorientation
• Repetitive facial movements — lip smacking, chewing, excessive salivation
• Sudden vocalization
• One-sided body movements or head turning
• Apparent hallucinations — the cat appears to be watching or reacting to things that aren't there

These presentations are sometimes not recognized as seizures by owners, leading to delayed diagnosis. If your cat shows any of these episodes repeatedly, discuss them with your veterinarian.

Medication differences — important

Several anti-seizure medications commonly used in dogs are dangerous or ineffective in cats. This is one of the most critical differences between canine and feline epilepsy management:

Monitoring requirements in cats on anti-seizure medication

Because cats handle these medications differently — and because phenobarbital in particular carries liver risks in felines — monitoring schedules for cats on anti-seizure drugs typically require more frequent liver function testing than for dogs. Your veterinarian will establish an appropriate monitoring schedule based on the specific medication used.

Prognosis in cats

Prognosis in feline epilepsy depends significantly on the underlying cause. Cats with structural epilepsy due to brain tumors or inflammatory brain disease generally have a more guarded prognosis than those with idiopathic epilepsy. Cats with well-controlled idiopathic epilepsy on appropriate medication can have a reasonable quality of life. Thorough investigation of the underlying cause is important because it directly determines the treatment approach and expected outcome.