Dog Seizures: Causes, What to Do & When It’s an Emergency

Last updated: May 6, 2026

Few things are as frightening as watching your dog have a seizure for the first time. The sudden loss of control, the involuntary movements, the glassy eyes — it leaves most owners feeling helpless and panicked. But understanding what dog seizures are, why they happen, and how to respond can make an enormous difference in how you handle the situation and how quickly your dog gets the help they need.

Seizures in dogs are more common than most people expect, affecting an estimated one to five percent of all dogs. Whether your dog has just experienced their first seizure or has been diagnosed with epilepsy, this guide covers everything you need to know — from causes and types to emergency protocols and long-term management.

What Dog Seizures Look Like

A seizure occurs when there is abnormal, uncontrolled electrical activity in the brain. The outward signs can range from subtle and easy to miss to dramatic and unmistakable, depending on the type and severity of the episode.

The most recognizable form involves a dog falling to the ground, becoming stiff, and paddling their legs rhythmically while lying on their side. Their jaw may clamp or chatter, they may drool excessively, and some dogs lose control of their bladder or bowels. Not all dog seizures look this way, however. Some present as a brief moment of staring blankly, a sudden twitching of one limb, or repetitive snapping at the air. These milder episodes are easy to dismiss as odd behavior if you do not know what to look for.

Most seizures follow a three-phase pattern. The pre-ictal phase (or aura) comes first: your dog may become restless, clingy, anxious, or start whining minutes or hours before the seizure begins. The ictal phase is the seizure itself, which typically lasts anywhere from 30 seconds to two minutes. The post-ictal phase follows, during which your dog may appear disoriented, temporarily blind, wobbly, excessively thirsty, or unusually tired. This recovery period can last from a few minutes to several hours.

Types of Seizures in Dogs

Veterinarians classify dog seizures into three main categories based on how much of the brain is affected and how the seizure presents.

Focal (Partial) Seizures

Focal seizures originate in one specific area of the brain and affect only one part of the body. You might see twitching on one side of the face, one leg jerking rhythmically, or unusual repetitive behaviors like excessive lip licking, head shaking, or fly-biting motions. The dog may or may not be fully conscious during a focal seizure. These episodes are often brief and can be subtle enough that owners initially mistake them for quirky behavior rather than a neurological event. Focal seizures can sometimes progress into generalized seizures.

Generalized Seizures

Generalized seizures affect both sides of the brain simultaneously and are the most commonly recognized type. Tonic-clonic seizures (formerly called grand mal seizures) involve an initial stiffening phase followed by rhythmic jerking movements. Tonic seizures involve stiffening without the jerking, while clonic seizures involve jerking without the initial stiffness. In all cases, the dog loses consciousness and has no voluntary control over their body.

Cluster Seizures

Cluster seizures are defined as two or more seizures occurring within a 24-hour period. They are considered more serious than isolated seizures because the brain does not have adequate time to recover between episodes, which increases the risk of brain damage, dangerously elevated body temperature, and status epilepticus — a seizure that lasts longer than five minutes or a series of seizures with no recovery between them. Cluster seizures always warrant urgent veterinary attention.

Causes of Dog Seizures

The list of potential causes behind dog seizures is long, which is why a thorough veterinary workup is essential. The most common causes fall into several broad categories.

Idiopathic Epilepsy

Idiopathic epilepsy is the single most common cause of seizures in dogs, particularly in dogs between one and five years of age. “Idiopathic” means the cause is unknown — there is no identifiable structural or metabolic reason for the seizures. The condition is believed to have a strong genetic component, and certain breeds are predisposed, including Labrador Retrievers, Golden Retrievers, German Shepherds, Beagles, Belgian Tervurens, Border Collies, and Australian Shepherds. If you are researching breeds, our dog breeds directory includes health information for many popular breeds.

Toxin Exposure

Many common household substances can trigger seizures in dogs. Xylitol (an artificial sweetener found in sugar-free gum and some peanut butters), chocolate, caffeine, certain rodent poisons, slug and snail bait (metaldehyde), and some human medications — particularly antidepressants and ADHD medications — are among the most frequent culprits. Insecticides, lead, and certain plants can also cause seizures. Toxin-induced seizures often come on suddenly in an otherwise healthy dog and may be accompanied by vomiting, diarrhea, or other signs of poisoning.

Liver Disease

The liver plays a critical role in filtering toxins from the blood. When the liver is not functioning properly — due to a portosystemic shunt, chronic liver disease, or acute liver failure — toxins such as ammonia can accumulate in the bloodstream and reach the brain, triggering seizures. This condition, called hepatic encephalopathy, is particularly worth considering in young dogs with unexplained seizures, as congenital liver shunts are not uncommon. Seizures related to liver disease are often accompanied by other signs like poor appetite, weight loss, excessive thirst and urination, or a distended abdomen.

Brain Tumors

In dogs over five years of age who experience their first seizure, a brain tumor is one of the diagnoses veterinarians will consider seriously. Brain tumors — both primary tumors that originate in the brain and secondary tumors that have metastasized from elsewhere — can cause seizures by disrupting normal brain activity in the region where they are growing. Meningiomas are the most common primary brain tumor in dogs. Seizures caused by brain tumors may worsen in frequency or severity over time, and the dog may develop other neurological signs such as changes in behavior, circling, head tilting, or vision changes.

Other Causes

Additional causes include low blood sugar (hypoglycemia), especially in small breed puppies; kidney disease; infectious diseases such as distemper or encephalitis; head trauma; heatstroke; and electrolyte imbalances.

What to Do During a Dog Seizure

Your response during a seizure matters, even though it may feel like there is nothing you can do. Here is how to handle it:

• Stay calm. Your dog is not in pain during a seizure. They are unconscious and unaware of what is happening. Panicking will not help them, and it will make it harder for you to take the right steps.
• Protect them from injury. Gently move furniture, sharp objects, or anything your dog could hit during the seizure. If they are near a staircase or elevated surface, carefully block or move them away from the edge without restraining them.
• Time the seizure. Use your phone to note when the seizure starts and stops. This information is extremely valuable for your veterinarian. A seizure that lasts longer than five minutes is a medical emergency.
• Record video if possible. If someone else is present, ask them to record the seizure on their phone. Video is one of the most helpful things you can provide to a veterinarian, as it allows them to see exactly what happened and identify the type of seizure.
• Speak softly. During the post-ictal phase, when your dog is coming out of the seizure, a calm, quiet voice and gentle presence can help them reorient. Keep the room dim and quiet if you can.
• Note what happened before. After the seizure is over, write down anything unusual that preceded it — changes in behavior, new foods, exposure to chemicals, recent medications, time of day. Patterns help veterinarians narrow down the cause.

What NOT to Do During a Dog Seizure

There are several instinctive responses that can actually make the situation worse or put you at risk.

Do not put your hand or any object in your dog’s mouth. Dogs cannot swallow their tongues during a seizure. This is a persistent myth. Putting your fingers near a seizing dog’s mouth puts you at serious risk of being bitten — not out of aggression, but because the jaw muscles may clamp down involuntarily with significant force.

Do not try to hold your dog down or restrain them. Restraining a seizing dog will not shorten the seizure and may cause injury to the dog or to you. Let the seizure run its course while keeping the environment safe.

Do not shout at your dog or try to snap them out of it. Loud noises and stimulation can potentially make the seizure worse or prolong the post-ictal phase. A calm, quiet environment is best.

Do not give food or water immediately after. Wait until your dog is fully alert and walking normally before offering water. Food can wait even longer. A dog that is still disoriented may choke.

When Dog Seizures Are an Emergency

While a single, brief seizure in an otherwise healthy dog is concerning and warrants a veterinary appointment, certain situations require immediate emergency care:

Status epilepticus is a life-threatening condition. When a seizure continues without stopping, body temperature rises dangerously, brain cells begin to suffer damage, and organ function can be compromised. This is a situation where minutes matter.

How Dog Seizures Are Diagnosed

If your dog has a seizure, your veterinarian will take a systematic approach to determine the cause. The diagnostic process typically begins with a thorough physical and neurological examination, followed by blood work and urinalysis to check for metabolic causes such as liver dysfunction, kidney disease, low blood sugar, or electrolyte imbalances.

If initial tests are normal and your dog fits the typical profile for idiopathic epilepsy — between one and five years old, otherwise healthy, normal between seizures — your veterinarian may make a presumptive diagnosis and discuss treatment options. If the presentation is atypical or the dog is older, advanced diagnostics may be recommended, including an MRI to look for structural brain abnormalities, a CT scan, or a cerebrospinal fluid (CSF) tap to check for infections or inflammation in the brain.

A seizure diary is one of the most useful tools in the diagnostic process. Recording the date, time, duration, and character of each seizure — along with any potential triggers — gives your veterinarian a detailed picture that lab work alone cannot provide.

Treatment and Medication for Dog Seizures

Treatment for dog seizures depends on the underlying cause. If the seizures are caused by a toxin, the first priority is treating the poisoning. If they are caused by liver disease or another metabolic condition, treating the underlying illness may reduce or eliminate the seizures entirely.

For idiopathic epilepsy, treatment focuses on reducing the frequency and severity of seizures with anticonvulsant medication. Most veterinarians recommend starting medication if the dog is having more than one seizure every four to six weeks, if seizures are becoming more frequent or severe, if the dog has had cluster seizures or status epilepticus, or if the post-ictal phase is particularly prolonged or severe.

The most commonly prescribed anticonvulsant medications for dogs include:

• Phenobarbital — one of the oldest and most widely used anticonvulsants in veterinary medicine. It is effective, relatively inexpensive, and available in tablet and liquid form. It requires periodic blood monitoring to check drug levels and liver values.
• Potassium bromide (KBr) — often used as an add-on therapy alongside phenobarbital or as an alternative in dogs that cannot tolerate phenobarbital. It is processed by the kidneys rather than the liver, making it a useful option for dogs with liver concerns.
• Levetiracetam (Keppra) — a newer anticonvulsant that has gained popularity due to its relatively mild side effect profile. It is often used as an add-on medication and is considered especially useful for managing cluster seizures.
• Zonisamide — another newer option that may be used alone or in combination with other medications. It is generally well tolerated and may be preferred in certain cases.

Anticonvulsant medication must be given consistently and should never be stopped abruptly. Suddenly discontinuing seizure medication can trigger severe rebound seizures worse than the original episodes. Any changes should be made gradually under direct veterinary supervision.

Living with an Epileptic Dog

A diagnosis of epilepsy can feel overwhelming, but most epileptic dogs live full, happy lives with proper management. Here is what long-term care typically looks like.

Consistent medication. Administer anticonvulsant medication at the same time every day. Set phone alarms if that helps. Missing doses or giving them late can lower drug levels enough to trigger a seizure. Keep a backup supply and plan ahead for travel or holidays.

Regular veterinary monitoring. Dogs on phenobarbital or other anticonvulsants need periodic blood tests — typically every six months — to ensure drug levels are within the therapeutic range and to check for any impact on organ function. These check-ups are not optional; they are a fundamental part of managing the condition safely.

Seizure diary. Keep a written or digital log of every seizure, including date, time, duration, type, and any potential triggers. This log helps you and your veterinarian assess whether the current treatment plan is working and make adjustments as needed.

Environmental management. Some dogs have seizure triggers that can be partially managed. Common triggers include stress, excitement, changes in routine, sleep deprivation, and extreme temperatures. While you cannot eliminate every trigger, maintaining a calm, predictable routine can help reduce seizure frequency in some dogs.

Emergency plan. Know where your nearest emergency veterinary clinic is and keep their number saved in your phone. If your veterinarian has prescribed rectal diazepam or intranasal midazolam for at-home emergency use, make sure every member of your household knows where it is stored and how to administer it. Having a plan reduces panic and improves response time when it matters most.

Quality of life. Epileptic dogs can still enjoy walks, play, training, and socialization. The condition requires management, not isolation. Many dogs with well-controlled epilepsy go months or even years between seizures. If you are considering adopting a dog with a known seizure history, these dogs can be wonderful companions with the right care.

Frequently Asked Questions

Can dog seizures cause brain damage?

A single, brief seizure that lasts under two minutes is unlikely to cause lasting brain damage. However, prolonged seizures (status epilepticus lasting more than five minutes) or frequent cluster seizures can cause permanent neurological damage due to sustained abnormal electrical activity and elevated body temperature. This is why prompt treatment of prolonged or repeated seizures is so important.

Are certain dog breeds more prone to seizures?

Yes. Breeds with a higher incidence of idiopathic epilepsy include Labrador Retrievers, Golden Retrievers, German Shepherds, Beagles, Belgian Tervurens, Border Collies, Australian Shepherds, Irish Setters, Bernese Mountain Dogs, and several terrier breeds. However, seizures can occur in any breed, including mixed breeds. You can learn more about breed-specific health concerns in our dog breeds directory.

Can diet affect dog seizures?

Some veterinary neurologists recommend medium-chain triglyceride (MCT) supplementation or specially formulated diets for epileptic dogs. While diet alone is unlikely to control seizures, it may play a supportive role alongside medication. Discuss any dietary changes with your veterinarian before implementing them.

What is the life expectancy of a dog with epilepsy?

Dogs with well-managed idiopathic epilepsy can live a normal or near-normal lifespan. The condition is not typically life-shortening when seizures are controlled with medication and the dog receives regular veterinary care. Prognosis is more affected when seizures are caused by an underlying condition such as a brain tumor or progressive liver disease.

Should I take my dog to the vet after a single seizure?

Yes. Even if the seizure was brief and your dog appears to have recovered fully, a veterinary visit is important. A first seizure should be evaluated to rule out treatable causes and to establish a baseline for monitoring. Your veterinarian may recommend blood work and other diagnostics, or they may advise monitoring at home with specific instructions for when to return. Either way, the information gathered from that initial visit is valuable.

Can stress cause seizures in dogs?

Stress is not a direct cause of epilepsy, but it can act as a trigger in dogs that are already prone to seizures. Stressful events such as thunderstorms, fireworks, travel, boarding, or major changes in the household have been reported by many owners as preceding seizure episodes. Reducing stress through routine, environmental management, and appropriate calming strategies may help lower seizure frequency in susceptible dogs.