Seizure — Symptom Decision Guide for Cats

How to recognize seizures in cats, likely causes (structural disease, toxins, metabolic, idiopathic), what to check at home, and when to seek emergency or scheduled veterinary care.

Quick Assessment

Is this an emergency?

- Yes: any seizure lasting more than 5 minutes, repeated seizures (two or more) within 24 hours (cluster seizures), or any seizure followed by collapse, difficulty breathing, blue/pale gums, unresponsiveness, or trauma. Get to an emergency vet immediately.

- No (but urgent): a single brief seizure (<2–3 minutes) with full recovery and normal breathing — schedule a vet visit within 24–48 hours.

Most common causes: metabolic (low blood sugar, liver/kidney disease), toxin exposure (permethrin, organophosphates), structural brain disease (tumor, inflammation such as FIP), and idiopathic epilepsy (less common in cats than dogs).

When to see a vet: emergency center immediately for prolonged/cluster seizures or any seizure in a very young, elderly, pregnant, or systemically ill cat. For a single short seizure with full recovery, arrange a vet appointment within 24–48 hours.

What a seizure looks like (what owners usually see)

Seizures can vary. Typical generalized seizures often include:

• Sudden collapse and loss of awareness
• Rhythmic paddling of the limbs, stiffening (tonic) or jerking (clonic)
• Vocalization, drooling or foaming at the mouth
• Urination and/or defecation
• Rapid breathing during or after the event
• Post-ictal period: disorientation, pacing, blindness, excessive vocalization, restlessness or sleepiness for minutes to hours after the seizure

Likely causes (ranked common → less common)

(References: Merck Veterinary Manual; ASPCA Animal Poison Control.)

Decision tree — If [symptom] + [other sign] → likely [cause] → action

• If seizure + known recent application of dog flea/tick product on the cat or contact with dog-treated bedding → likely permethrin toxicity → emergency vet immediately (decontaminate and anticonvulsant therapy).

• If seizure + recent lily ingestion or vomiting, increased drinking/urination, decreased appetite → possible lily-induced acute kidney injury → emergency vet (IV fluids, bloodwork, decontamination if recent, monitor kidney values).

• If seizure + history of chronic kidney disease, high BUN/creatinine, uremic breath or vomiting → likely uremic encephalopathy → urgent vet care for stabilization and renal support.

• If seizure + signs of liver disease (jaundice, excessive drooling, confusion, prior portosystemic shunt diagnosis) or low blood glucose → likely hepatic encephalopathy or hypoglycemia → check blood glucose immediately; if low (<60 mg/dL) → emergency care.

• If seizure + fever, weight loss, ocular signs (uveitis), young age → consider FIP (neurologic form) → urgent veterinary work-up (neurologic exam, imaging, CSF analysis, FIP testing).

• If seizure in an older cat with progressive one-sided neurologic signs → consider brain tumor or stroke → schedule immediate diagnostic work-up with your vet (neurologic exam, MRI/CT).

• If a single brief seizure with full recovery and a normal exam → could be isolated event or idiopathic epilepsy → schedule vet visit within 24–48 hours for baseline tests.

Home assessment steps (what to check, what to measure)

When it's an emergency — clear red flags

Seek emergency veterinary care now if any of these are present:

• Seizure lasting longer than 5 minutes
• Two or more seizures within 24 hours (cluster seizures)
• Seizure followed by collapse, coma, or inability to breathe normally
• Blue, white, or very pale gums; prolonged bleeding or severe trauma
• Temperature >104°F (40°C) or >105°F (40.5°C is critical)
• Seizure in a kitten (<6 months), very old cat, pregnant cat, or cat with known heart/kidney/liver disease
• Known or suspected exposure to a highly toxic substance (permethrin, organophosphate, certain human meds)

When to schedule a vet visit (non-urgent but needs attention)

• Single short seizure (<2–3 minutes) with full recovery and normal breathing — arrange same-week or within 24–48 hour appointment.
• Any first-time seizure in a cat — needs diagnostic work-up (bloodwork, blood glucose, neurological exam).
• Recurrent short seizures but not clustered and the cat is stable — book veterinary neurology work-up.
• New neurologic signs between seizures (head tilt, circling, visual deficits, progressive malaise) — prompt veterinary attention.

Home care — safe things to do while monitoring

• Stay calm and protect the cat from injury: move furniture or sharp objects away, place a pillow or towel under the head if possible. Do not put your hands near the cat’s mouth.
• Time the event and record observations (duration, limb movements, urination, pupil size). Video record if safe.
• After seizure, keep the cat warm and quiet in a dark, quiet place while it recovers.
• If the cat is conscious and you know hypoglycemia is likely and glycemic supplement is available (e.g., Karo syrup), rub a small amount on the gums only if the cat is fully conscious and able to swallow. Do NOT attempt oral glucose if the cat is still seizing or unconscious.
• Do not induce vomiting at home if you suspect toxin exposure without veterinary advice.
• If you suspect permethrin exposure and the seizure is not ongoing, veterinary decontamination is indicated. Avoid washing the cat yourself unless advised — you may expose yourself to the toxin. If you must remove product immediately (very fresh exposure), wear gloves and follow veterinary guidance.

What your vet will likely do

Veterinarians will stabilize the cat (secure airway, control active seizures with anticonvulsants such as midazolam or phenobarbital, fluids), check blood glucose and electrolytes, run bloodwork (CBC, chemistry, bile acids/ammonia if liver disease suspected), and may recommend imaging (MRI/CT) and cerebrospinal fluid analysis if a structural or inflammatory brain disease is suspected. Toxin-specific treatments (decontamination, antidotes) and supportive care will be given as appropriate.

What to tell your vet — prepare this information

• Exact time seizure started and how long it lasted; number of seizures and spacing
• A video or clear description of what you observed (limbs, vocalization, loss of consciousness)
• Any recent medications or topical products used on the cat or household pets (especially dog spot-on flea/tick products)
• Recent access to plants (e.g., lilies), chemicals, human medications, or rodenticides
• Appetite/water changes, vomiting, diarrhea, recent weight loss, fever
• Pre-existing illnesses (kidney disease, liver disease, diabetes), prior seizure history, and current medications/doses
• Any trauma or falls, vaccination/travel history, and household exposure risks
• If you measured temperature or blood glucose, give those values and the time measured

Remember: this guide helps you decide how urgently to act, but it is not a diagnosis. Seizures can be caused by many problems — metabolic, toxic, infectious, or structural — and fast veterinary assessment can be life-saving. Immediate stabilization and diagnostics are often needed to find and treat the underlying cause.

Primary references: Merck Veterinary Manual (Seizures in Cats), ASPCA Animal Poison Control; consult your local veterinarian for case-specific advice.

Frequently Asked Questions