If Your Pet Suddenly Has a Seizure — Emergency Response and When to Go to the Vet

Brain & CognitionSymptomsMeongsiljang Veterinary Advisory Board

Pet seizures are an emergency neurological symptom caused by abnormal electrical activity in the brain. If a seizure lasts longer than five minutes or recurs two or more times within 24 hours, seek veterinary care immediately.

What Are Pet Seizures? What to Do Right Now

A pet owner timing the seizure while staying by their pet's side.

Pet seizures are a neurological emergency in which abnormal electrical signals in the brain cause muscle tremors or loss of consciousness. Staying calm is the most important thing. Do not restrain your pet or put your hands in its mouth. Instead, clear away any sharp objects nearby, lay your pet down on the floor, time the episode, and record a video. If the seizure lasts longer than five minutes or recurs two or more times within 24 hours, seek immediate veterinary care.

Criteria for Assessing Seizure Severity

The urgency of seizures varies depending on their duration and frequency. Use the table below to first assess which stage your pet is currently in. In particular, "status epilepticus (lasting more than 5 minutes)" pose a very high risk of brain damage.

Emergency Levels by Seizure Duration and Frequency

Item	Mild	Caution	Emergency
Duration	Within 1–2 minutes	2–5 minutes	5 minutes or more (status epilepticus)
Frequency	Single occurrence	Once a day	2 or more times within 24 hours (cluster seizures)
Recovery of consciousness	Usually recovers within a few minutes	Tens of minutes to several hours (varies greatly by individual)	No recovery of consciousness between seizures
Response	Record video, then book an appointment	Visit the same day	Go to ER immediately

Duration and frequency follow the definitions of cluster seizures and status epilepticus, and recovery after a seizure (the postictal period) varies from several minutes to several hours depending on the individual.

Checklist of Symptoms During a Seizure

Seizures can be generalized, affecting the entire body, or focal, affecting only a part of it. If you notice any of the following signs, be sure to record a video.

Stiffening: The body becomes rigid and the animal may fall to one side.

Tremors: The limbs shake rhythmically and repetitively.

Loss of consciousness: The animal does not respond when called.

Foaming or drooling: Foam or saliva appears at the corners of the mouth.

Incontinence: Urination or defecation occurs involuntarily.

Chewing motions: The mouth moves as if chewing something.

Illustrated checklist for checking seizure symptoms in pets

When to Go to the Emergency Room Immediately

If any of the following apply, do not hesitate—take your pet to a 24-hour emergency animal hospital immediately: - Seizures lasting more than 5 minutes - Two or more seizures occurring within 24 hours - Failure to regain consciousness within 30 minutes after a seizure - Irregular breathing or bluish gums - Pregnancy or age under 4 months - A history of diabetes, liver disease, or exposure to toxins

Main Causes of Seizures

The treatment approach for seizures varies significantly depending on the underlying cause. Veterinary internal medicine textbooks generally categorize these causes into three main groups:

Idiopathic epilepsy: A genetic predisposition causing recurrent seizures with no identifiable cause, most commonly diagnosed between 6 months and 6 years of age.

Structural brain disorders: Abnormalities within the brain itself, such as brain tumors, encephalitis, or hydrocephalus.

Metabolic or toxic causes: Conditions like hypoglycemia, hepatic encephalopathy, or poisoning from chocolate, xylitol, or pesticides.

Because idiopathic epilepsy is extremely rare in cats compared to dogs, it is especially important to conduct a comprehensive evaluation for all potential causes when a cat experiences a seizure. This includes assessing extracranial factors, such as metabolic or toxic issues, as well as intracranial factors, such as structural or infectious conditions.

Illustration of the brain structures of dogs and cats

Diagnostic Process at the Veterinary Hospital

A single seizure isn't enough to pinpoint the cause, so a step-by-step diagnostic approach is necessary. We start with basic blood work, including liver and kidney function tests and blood glucose levels, and proceed to MRI, CT, or cerebrospinal fluid analysis as needed to examine the brain in detail. Your veterinarian can significantly narrow down the potential causes by reviewing imaging results alongside the seizure pattern, so be sure to bring any videos you've recorded of the episodes.

Emergency Response Guidelines You Can Follow at Home

Responding incorrectly during a seizure can actually be dangerous. Please keep the following guidelines in mind. Do: Clear away surrounding obstacles, lay your pet on the floor, time the episode, record a video, maintain a quiet and dim environment, and check body temperature. Do not: Put your hands or objects in their mouth (they will not swallow their tongue), press down hard on their body, splash cold water on them, pick them up and shake them, or call out loudly. Even after the seizure stops, your pet may remain disoriented or confused for 30 minutes to an hour, so please allow them to rest quietly.

Calmly comforting your pet after a seizure

Cat Seizures Require More Caution

Although cats experience seizures less frequently than dogs, the occurrence of a seizure often indicates a serious underlying condition. It is crucial to first rule out exposure to toxic substances—such as lilies, essential oils, or dog-specific pesticides—as well as potential causes like hypertension, end-stage renal failure, or infectious encephalitis. Because idiopathic epilepsy is rare in cats, it is essential to thoroughly evaluate both intracranial and extracranial causes. Therefore, we strongly recommend seeking veterinary care as soon as possible, even after a single seizure episode.

Key Points for Recurrence Prevention and Lifelong Management

If your pet is diagnosed with idiopathic epilepsy, they will likely need to take anticonvulsant medication for the rest of their life. Your veterinarian will determine the appropriate dosage and frequency based on your pet’s weight, so never stop or reduce the medication on your own. Abruptly discontinuing the drug can trigger more severe conditions, such as status epilepticus, where seizures last longer than five minutes. At home, consistently keeping a seizure diary—recording the date, time, duration, and circumstances of each episode—greatly helps narrow down potential triggers and guide treatment decisions. Additionally, since toxic substances like chocolate, xylitol, and pesticides can induce seizures on their own, please ensure these items are kept securely out of your pet’s reach at all times.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Can a dog swallow its tongue during a seizure?

No, dogs do not swallow their tongues during a seizure. Putting your hand or any object in their mouth can actually lead to you being bitten or cause injury to their teeth and jaw, so please never do this.

How can you tell the difference between trembling during a dream and having a seizure?

Twitching during sleep typically responds to being called by name or a gentle touch. In contrast, seizures do not respond to calling, and may involve the eyes fixed in one direction or a loss of consciousness.

My pet had one seizure, but seems fine now. Should I still take them to the vet?

Yes, it's best to visit within a day or two. Even isolated seizures can have underlying causes such as brain tumors or metabolic abnormalities, so basic blood tests and a neurological examination are necessary.

Once we start giving medication, does it need to be continued for life?

Idiopathic epilepsy usually requires lifelong medication. Stopping the medication on your own can lead to more severe seizures (cluster seizures). Your veterinarian may adjust the dosage as needed.

After a seizure, my pet seems disoriented and has trouble seeing. Is this normal?

In the 30 minutes to several hours following a seizure, it’s common for pets to experience disorientation, temporary vision impairment, and wandering. These symptoms typically resolve on their own, but if they persist for more than 24 hours, further veterinary evaluation is necessary.