Seizures in Dogs

By Janice Jones | Last updated January 21, 2026
Former veterinary technician • Small-breed dog breeder & advocate

Seeing your dog have a seizure can be frightening, especially if it happens without warning. Seizures range from brief, mild episodes to more serious medical emergencies, and they can have many different causes.

This page explains why seizures happen in dogs, what they look like, what to do during an episode, and when veterinary care is essential, using clear, calm, evidence-based information.

What Causes Seizures in Dogs?

Unfortunately, a plethora of causes may lead to brain disorders. Disorders of the brain may arise as a result of physical injury, poisoning (by a substance in the environment or from the effects of a chronic disease elsewhere in the body), infection (of the brain itself or of its surrounding membranes) or tumor growing in the brain tissue.

Most brain disorders cause a variety of signs and symptoms. One of the most commonly seen signs associated with brain disorders is seizures. 

Veterinarians will classify the causes based on where the problem originated: within the brain (Intracranial) or outside of the brain (extracranial). The extracranial causes can originate within the body or the environment.

Seizures in dogs can occur in many different circumstances.

• Physical pressure – brain injury, scar tissue formation, brain tumors, hydrocephalus (accumulation of fluids in the brain)
• Changes in blood parameters – low levels of calcium, low levels of sugar
• Migrating intestinal worm larvae
• Post-distemper encephalitis
• Poison-induced brain alterations
• Heatstroke

What's the Difference Between Seizures and Epilepsy?

Seizures vs. Epilepsy – definitions, and meaning

A general seizure involves a loss of consciousness accompanied by involuntary activities such as muscle contractions, paddling with the limbs, trembling and facial twitching. During a seizure, dogs frequently salivate, urinate and defecate. The pupils of the eyes are usually dilated.

A partial seizure involves only some of these changes and does not necessarily include loss of consciousness. 

In epilepsy, a disturbance in electrical activity in the brain causes a seizure. The term epilepsy is often used to refer to a condition in which a dog suffers frequent or recurring seizures.

Epilepsy

Epilepsy is the most common cause of seizures in dogs. It occurs when there is abnormal burst of electrical activity in the brain. The electrical burst, because of its size and sudden onset, cannot be transmitted through its proper channels, thus causing loss of consciousness and involuntary movements. 

Depending on their severity and duration, seizures may be classified as:

Mild:  Seizures occurring in clusters (the seizures start and stop in groups, one right after another, without regaining consciousness in between)

Prolonged: lasting more than 5 minutes

Can Seizures be Inherited?

Also, it should be noted that there is an inherited tendency to seizures in dogs to some breeds. Dogs that have a family history of seizures should not be used for breeding purposes.  Breeds with a high incidence of or inherited predisposition to epilepsy include:

Since flat-faced breeds are prone to hydrocephalus and hydrocephalus is one of the causes, breeds at risk also include:

Grand Mal vs. Petit Mal Seizures in Dogs

A seizure can be a frightening event to everyone involved.  It may be very dramatic or so subtle that that it is easily dismissed as a momentary loss of concentration. Dramatic seizures, are often called ‘’grand mal’’ and include three stages:

1. The dog shows behavioral changes, which may include:

• Restlessness
• Comfort-seeking
• Anxiety
• Hiding
• Whimpering
• Crying

2. The dog collapses and losses consciousness, while its body becomes rigid. This is usually followed by:

• Abnormal muscle activity
• Rhythmic jerking
• Paddling of the legs
• Collapse
• Involuntary Urinating
• Defecating
• Vomiting
• Chomping with their teeth or biting their tongue
• Excessive salivating, drooling, "foaming at the mouth"

This phase can last from seconds to minutes. In rare instances, it can last longer, and it is referred to as status epilepticus. 

3. Consciousness returns and the dog is:

• Dazed
• Confused 
• Temporarily unable to stand
• Temporarily unable to see

This disorientation can last from few minutes to several hours. 

Milder seizures, called ‘’petit mal’’ seizures, are shorter in duration. An affected dog may only stumble and lose consciousness for less than a second. In other cases, the only sign of a seizure is unusual behavior, such as repeated snapping at the air as if to catch a fly or frenzied digging for no apparent reason. This condition is called psychomotor epilepsy. 

Seizures in Dogs or Just Plain Dreaming

Since dogs tend to move somewhat when sleeping, legs may jerk, mouth might open and shut, muscles may twitch.  You may hear a quiet cry or the sound resembling a bark. 

Some also paddle their legs in a way that looks like they are swimming. One might wonder if the dog is just dreaming or having a seizure. After witnessing one seizure, you will always be able to tell the difference between the two.

What Should I do if my Dog Has a Seizure?

If your dog has seizures, you need to focus on two things:

• Protecting yourself – a dog having a seizure may unintentionally bite.
• Protecting your dog: pull it by the scruff of the neck away from potential threats in its surroundings. Place something soft, such as pillows or a blanket, around and under the dog’s head. 

For short seizures, comfort your dog with soothing words and gentle stroking. For longer seizures, provide comfort and make arrangements to see your vet as soon as possible.

After the seizure, give your dog some water. If the dog appears confused and disoriented, confine it and stay with it. Touch and a familiar voice are extremely reassuring to dogs with seizures.

What if the Seizure Won't Stop?

This is a medical emergency that requires immediate veterinary care. If the seizure lasts more than about five minutes, the dog will need intravenous anticonvulsants to stop the seizure.  This is called Status Epilepticus.

What Not to Do if Your Dog is Having a Seizure

What to do if your pet is having a seizure

Seizures can be frightening to a pet parent and doubly so for children who may be observing.  Your dog is also under stress.  During times of stress, we may not function as well as we could and may do something that might harm our dog or ourselves.

• Do not try to move your dog, as you could get bitten.
• Don't pick up your little dog and hold it in your lap.  The best and safest place for him is on the floor away from furniture or objects that could hurt him.
• Don't try to hold his head during a seizure because you could get bitten.
• Do not try to give your dog any medication, water, or food during a seizure, unless your veterinarian has prescribed an emergency drug.
• Never punish a dog for involuntary urinating or defecating while seizing.

Diagnosing Seizures in Dogs

The diagnosis should be based on the dog’s history (retrieved by talking with the owner) and the presenting clinical signs.

To rule out other diagnoses, the dog should undergo a full physical examination, including a neurological exam, blood tests, and an EEG.

If needed, the veterinarian may require additional diagnostic procedures, such as cerebrospinal fluid analysis, x-rays, CT, and MRI scans.  

Treatment Options for Seizures in Dogs

Treatment for seizures involves treating the underlying problem as well as the seizures themselves.  Often, the cause of the seizure can be identified and treated, and then no further treatment is necessary.  If your dog is having frequent seizures lasting for 90 seconds or more, he will require treatment.

If no cause can be determined, your vet will identify the seizures as idiopathic epilepsy.

For dogs with idiopathic epilepsy, a medication (anticonvulsant or antiepileptic) may be prescribed that will need to be given daily for the rest of the dog's life. These drugs do not cure the disease, but rather, they control the seizures.

Phenobarbital is one of the commonly prescribed medications used to manage seizures in dogs. Your veterinarian will determine the most appropriate treatment based on your dog’s seizure type, frequency, age, and overall health.

Potassium bromide is another very old but effective drug used to treat seizures in dogs.  This drug is not used in people any longer as it has a tendency to cause psychological problems.

Can Dogs Live a Normal Life with Seizures?

Many dogs with seizures or epilepsy live long, comfortable lives with proper veterinary care. While seizures can’t always be cured, they can often be managed successfully, allowing dogs to enjoy normal routines and activities.

Living with Epilepsy

Your dog is still your furbaby and can lead a relatively happy life.  You will have to adjust your schedule so you can give him his daily medication, and be aware that he may still have a seizure now and again. 

The medication and treatment provided by your vet will help your dog stay comfortable and participate in all the activities you enjoy together.  

Reference & Further Reading on
Seizures in Dogs

This article is for informational purposes only and is not intended to replace the help of a veterinarian.  Please contact your vet if your dog has had a seizure and obtain professional assistance.

Canine Epilepsy Network

Canine Epilepsy Guardian Angels