Seizures and epilepsy in dogs and cats: signs, tests and care

A seizure is a brief episode caused by abnormal electrical activity in a dog's brain. It can affect movement, awareness, behaviour or automatic body functions such as salivation.

Not every seizure looks like a full-body convulsion. Some are much subtler, so the pattern before, during and after the episode helps a vet decide whether it was likely to be a seizure. [1]

No. A seizure is an event, while epilepsy describes an ongoing brain disorder that makes unprovoked seizures recur.

A single episode can have several possible explanations and does not by itself establish epilepsy. The vet first considers whether the event was truly a seizure, then looks for its cause and whether it has recurred. [1]

A generalised convulsive seizure usually affects both sides of a dog's body, often causing collapse, loss of awareness, stiffening, jerking or paddling movements.

Salivation and loss of bladder or bowel control can also occur. Some generalised seizures begin with a brief focal sign, so any unusual movement or behaviour just before the collapse is worth recording. [1]

A focal seizure affects a limited brain network, so signs may involve one area of the body or a brief change in behaviour rather than a full-body convulsion.

Possible signs include facial twitching, rhythmic blinking, repeated head or limb jerks, salivation, vomiting, sudden fear or unusual attention-seeking. A focal seizure can stay localised or spread into a generalised seizure. [1]

Some dogs show a longer-lasting change before a seizure, such as restlessness, anxiety, irritability, hiding or seeking extra contact.

This warning phase is called a prodrome and is not present in every dog. Brief odd behaviour immediately before convulsions may instead be the focal start of the seizure, so timing and video context matter. [1]

After a seizure, a dog may be confused, unsteady, restless, tired, unusually hungry or thirsty, or temporarily unable to see normally.

This recovery period is the post-ictal phase and can vary greatly between dogs and episodes. A dog that is not returning towards its usual awareness, has breathing difficulty or deteriorates needs emergency veterinary help immediately. [1]

Fainting can look like a seizure, and appearance alone may not separate them reliably. The trigger, muscle tone, awareness, associated signs and speed of recovery all provide useful clues.

A vet also checks the heart, circulation and nervous system because fainting may reflect a cardiovascular problem. A video helps, but it is most useful alongside a detailed history and examination rather than as a stand-alone diagnosis. [2]

Yes. Tremors and episodic movement disorders can resemble focal seizures, particularly when they cause sudden stiffening, jerking or unusual posture.

Awareness may remain normal during a movement disorder, and some episodes change with distraction, but these clues are not absolute. A full description, video and veterinary examination are safer than trying to label the event from one sign. [2]

A useful seizure record captures when the episode happened, how long it lasted, what the dog was doing beforehand, which body parts were affected and how recovery looked.

Video of the event and recovery can help the vet interpret the pattern. A continuing diary also shows whether episodes are becoming more frequent, prolonged or severe and how they relate to medication or possible triggers. [3]

A reactive seizure is the brain's response to a temporary problem elsewhere in the body or to a toxin, rather than epilepsy caused by a lasting brain disorder.

Examples include very low blood sugar, important electrolyte disturbance, liver-related toxin build-up or poisoning. Finding and correcting the underlying disturbance can stop the trigger, although the episode itself may still require urgent care. [2]

Structural epilepsy means seizures are being caused by disease or damage within the brain itself.

Possible causes include inflammation or infection, a tumour, a blood-vessel problem, previous trauma, a developmental abnormality or a degenerative disease. Brain imaging and sometimes cerebrospinal fluid testing help look for these causes. [1]

Idiopathic epilepsy is recurrent epilepsy without evidence of a toxin, metabolic problem or structural brain disease after an appropriate diagnostic assessment.

Some dogs have a confirmed or suspected genetic basis, while in others the cause remains unknown. It is a diagnosis of exclusion, not a conclusion based only on breed, age or a normal examination. [2]

A first suspected seizure warrants prompt veterinary assessment, even when the dog appears to have recovered fully.

The vet needs to decide whether the event was a seizure and investigate its possible cause. The history, physical and neurological examinations, age, recovery, possible toxin exposure and any video guide which tests are appropriate. [3]

Brain MRI looks for structural causes of seizures, while cerebrospinal fluid testing can add evidence about inflammation or infection around the brain.

These are specialist tests, not automatic tests for every dog. Their value depends on the dog's age at onset, examination, seizure pattern, earlier test results and whether a structural or inflammatory brain disorder remains a concern. [2]

Repeated seizures close together are an emergency, especially when another begins before the dog has fully recovered. Contact an emergency vet immediately.

Seizure clusters can escalate and may require a short-term emergency plan alongside investigation of the cause and review of any longer-term seizure treatment. The veterinary team decides the safest response for that dog. [4]

A dog that remains severely unresponsive, is struggling to breathe, deteriorates or has another seizure before recovering needs emergency veterinary help immediately.

Temporary confusion and unsteadiness can occur after a seizure, but recovery should trend towards the dog's usual awareness. The emergency team can assess complications, continuing seizure activity and the underlying cause. [1]

Long-term treatment is considered from the whole clinical pattern, not from one isolated feature or a fixed rule applied to every dog.

The decision weighs the cause, recurrence pattern, seizure severity, emergency episodes, recovery, other health problems, likely adverse effects and the practical impact on the dog and family. Treatment choice is individualised with the vet. [5]

The goal is the best possible seizure control with acceptable side effects and a good quality of life; complete seizure freedom is not always achievable.

Useful improvement can mean fewer seizures, shorter or less severe episodes, fewer clusters and easier recovery. The dog's wellbeing and the family's ability to manage the plan are part of judging success. [5]

Regular reviews help the vet compare seizure control with side effects and check whether the treatment remains safe and appropriate.

Depending on the medicine, monitoring may include a seizure diary, examination, blood tests and measurement of medicine concentration. New sedation, poor coordination, appetite or thirst changes, vomiting, diarrhoea or behaviour changes are relevant to the review. [5]

Stopping anti-seizure medicine abruptly can trigger seizure recurrence or a serious withdrawal seizure. Any reduction belongs in a gradual, vet-led plan.

Treatment is often long term, even when seizures have been controlled. If adverse effects or practical problems arise, the veterinary team can balance the risks of changing treatment against the risks of losing seizure control. [5]

Many dogs with epilepsy can have a good quality of life when seizures and treatment effects are kept within a manageable balance.

Quality of life includes more than seizure count: recovery, behaviour, sleep, mobility, appetite, medicine effects, emergency episodes and the impact on the household all matter. A diary helps bring those changes into veterinary reviews. [5]

A seizure is a brief episode caused by abnormal electrical activity in a cat's brain. It can change movement, awareness, behaviour or automatic functions such as salivation.

Cats do not always show a dramatic full-body fit. A focal episode may be limited to the face, mouth or one part of the body, which is why the full pattern and recovery matter. [6]

No. A seizure is one event, whereas epilepsy describes a condition in which seizures recur because the brain has an enduring tendency to generate them.

One episode may be caused by a temporary metabolic or toxic problem, structural brain disease or another seizure-like condition. The diagnosis depends on the history, examination and appropriate tests rather than the event alone. [7]

A generalised convulsive seizure can cause sudden collapse, loss of awareness, stiffening, trembling or jerking across both sides of a cat's body.

A cat may vocalise, salivate, clamp the jaw or lose bladder or bowel control. Some cats show only part of this pattern, so an incomplete list of classic signs does not rule a seizure out. [7]

A focal seizure may affect only part of a cat's body or cause a short, repeated change in movement, sensation or behaviour.

Facial twitching, salivation, chewing, licking, swallowing, head turning or an abrupt behavioural episode can be part of an orofacial seizure pattern. These signs have other possible causes, so video and clinical context are important. [6]

Some cats appear confused, nervous, restless or unusually withdrawn before a seizure, while others show no recognisable warning.

A longer-lasting change may be a prodrome, but a very brief behavioural change can also be part of a focal seizure. Recording when the behaviour starts in relation to the main episode helps the vet interpret it. [7]

After a seizure, a cat may be confused, frightened, unsteady, temporarily unable to see or hear normally, unusually hungry or thirsty, or behave out of character.

These post-ictal changes are temporary, but their pattern and progress matter. Severe unresponsiveness, breathing difficulty, deterioration or another seizure before normal recovery needs emergency veterinary help immediately. [6]

Fainting can resemble a seizure, so a collapse cannot be labelled reliably from one visible sign alone.

The trigger, awareness, movement, colour, breathing and recovery pattern all add context, while heart and neurological examinations look for different causes. A video is valuable, but the history before and after the collapse remains essential. [6]

Yes. Tremor, vestibular episodes and episodic movement disorders can all be mistaken for seizures in cats.

Whether awareness changes, which muscles are involved, what triggers the episode and how the cat recovers can help narrow the possibilities. Because overlap remains, video plus a detailed veterinary history is more useful than a label based on shaking alone. [6]

A useful record includes when the episode happened, its duration, what the cat was doing beforehand, the movements or behaviours seen and how recovery progressed.

Video can show details that are hard to remember under stress. A continuing diary helps the vet see changes in frequency, severity, recovery, possible triggers and response to any treatment. [7]

A reactive seizure is caused by a temporary toxic or metabolic disturbance outside the brain rather than by epilepsy from a lasting brain disorder.

Possible triggers include poisoning, very low blood sugar, severe electrolyte disturbance, liver or kidney dysfunction, high blood pressure and thiamine deficiency. Blood tests may be normal with some toxins; suspected poisoning needs urgent veterinary assessment. [6]

Structural epilepsy means an identifiable disease or injury within the brain is causing the cat's seizures.

Possible causes include inflammation or infection, a tumour, a stroke or other blood-vessel problem, trauma, a developmental abnormality or degeneration. Signs between seizures can increase concern, but a normal examination does not exclude every brain lesion. [6]

Idiopathic epilepsy, also called epilepsy of unknown origin, means no reactive or structural cause has been identified after an appropriate assessment.

It is reached by excluding other diseases rather than simply assuming a healthy-looking cat has primary epilepsy. The depth of testing depends on the cat's history, examination and clinical risk factors. [6]

A first suspected seizure warrants prompt veterinary assessment, even if the cat seems normal again afterwards.

The vet considers seizure mimics, possible toxin exposure, systemic illness and brain disease, then uses the history and physical and neurological examinations to choose initial tests. Video of the episode can be especially helpful. [6]

MRI gives detailed images of the brain to look for structural disease, while cerebrospinal fluid testing can add evidence about inflammatory or infectious causes.

These tests are considered after reactive causes have been assessed. MRI usually comes first, and the decision about fluid sampling balances its likely diagnostic value with the individual cat's imaging findings and procedure risks. [6]

A seizure that continues instead of stopping is an emergency. Contact an emergency vet immediately and follow the practice's instructions while help is arranged.

Prolonged seizure activity can become self-sustaining and harder to control, with a growing risk of serious complications. The emergency consensus therefore centres on early, rapid veterinary treatment. [4]

Repeated seizures close together are an emergency, particularly when another begins before the cat has fully recovered. Contact an emergency vet immediately.

Clusters can escalate and may need a short-term emergency plan alongside investigation of the cause and review of any longer-term medicine. The veterinary team decides the safest response for that cat. [4]

A cat that remains severely unresponsive, is struggling to breathe, deteriorates or has another seizure before recovering needs emergency veterinary help immediately.

Temporary disorientation and unsteadiness can occur after a seizure, but recovery should move towards the cat's usual awareness. The emergency team can assess continuing seizure activity, complications and the underlying cause. [1]

Long-term treatment is considered from the cause, recurrence, severity and recovery pattern, together with the cat's other health needs and tolerance of medicine.

The decision is individual because feline seizure disorders and responses to treatment vary. Some underlying causes need their own treatment, while cats with recurring epilepsy may need continuing anti-seizure medicine and follow-up. [7]

The goal is fewer or less severe seizures with acceptable treatment effects and the best achievable quality of life; complete seizure freedom is not always possible.

Success is judged from the whole pattern, including clusters, recovery, behaviour, appetite and day-to-day wellbeing. A seizure diary gives the vet a clearer basis for adjusting the plan. [7]

Regular reviews help the vet compare seizure control with side effects and check whether the treatment remains safe and suitable for the cat.

Monitoring can include the seizure diary, examination, blood tests and medicine concentrations, depending on the drug. Sedation, poor coordination, appetite or weight changes, skin reactions and altered behaviour are useful changes to report. [7]

Stopping anti-seizure medicine abruptly can cause withdrawal seizures or loss of seizure control. Any reduction belongs in a gradual, vet-led plan.

Some cats need treatment for life, while a carefully supervised reduction may be considered in selected cases after sustained control. The balance depends on the cause, medicine, adverse effects and relapse risk. [8]

Many cats with epilepsy can live normal, happy lives when seizure control and medicine effects are kept in a workable balance.

Quality of life includes recovery after episodes, appetite, grooming, interaction, mobility, sleep, medicine tolerance and the burden of emergencies. Those everyday observations matter alongside seizure frequency when the plan is reviewed. [7]