Seizures in Dogs: Warning Signs and Initial Assessment

What is a seizure in dogs?

A seizure in dogs is a sudden, usually brief neurological event caused by pathological overexcitation of nerve cells in the brain. Clinically, it often manifests as a generalized convulsive seizure accompanied by loss of consciousness, muscle twitching, drooling, and urination or defecation. There are also focal seizures characterized by twitching of individual muscle groups, staring, or behavioral changes.

Seizures are a symptom, not a diagnosis. In 2015, the International Veterinary Epilepsy Task Force (IVETF) established a standardized classification system. Every first-time seizure should be evaluated by a veterinarian. A seizure lasting more than 5 minutes or multiple seizures without recovery in between are considered status epilepticus—a life-threatening emergency.

Background + Scientific Context

The IVETF consensus reports by De Risio et al. (2015) and Berendt et al. (2015) define epilepsy as the occurrence of at least two unprovoked seizures separated by more than 24 hours. A distinction is made between idiopathic epilepsy, structural epilepsies (tumor, inflammation, trauma), and reactive seizures (metabolic, toxins).

The diagnostic approach follows a 3-step system: Tier I is based on medical history and age (typical onset between 6 months and 6 years), Tier II includes additional blood tests, and Tier III involves MRI and cerebrospinal fluid analysis. MRI and cerebrospinal fluid analysis are mandatory in cases of atypical age of onset, neurological abnormalities between seizures, or status epilepticus.

Epidemiologically, idiopathic epilepsy is the most common neurological disorder in dogs, with a prevalence of 0.6–0.75% (Kearsley-Fleet et al. 2013). Breeds with an increased predisposition include the Border Collie, Australian Shepherd, Belgian Shepherd, and Beagle.

Vitomalia-Position

Our clear recommendation is: See a veterinarian immediately after the first seizure. Even if the dog seems fine afterward, a diagnostic evaluation is essential. For dogs with epilepsy, a seizure diary—including the date, time, duration, and warning signs—is the most important diagnostic tool for the veterinarian.

We firmly reject downplaying the issue and self-treatment with home remedies. Seizures are a medical matter.

When does a seizure in a dog become critical?

Specific everyday situations that constitute an emergency:

Seizure lasting longer than 5 minutes – status epilepticus; go to the emergency room immediately
Multiple seizures within 24 hours without full recovery – cluster seizures, also a medical emergency
First seizure in a dog younger than 6 months or older than 6 years
Seizure following suspected poisoning or trauma – see Poisoning in Dogs
Behavioral changes between episodes – an indication of a structural cause

While not an emergency, brief, first-time episodes in dogs of typical age for the condition require urgent evaluation.

Practical Application – What to Do During a Seizure?

Stay calm: The dog is unconscious during the seizure and is unaware of anything. Panicking won’t help anyone.
Secure the area: Move furniture out of the way, pad any sharp edges, and block off stairways.
Don't hold the dog down, and don't put anything in its mouth: Dogs don't swallow their tongues. Holding the dog down increases the risk of injury.
Measuring time: Start the stopwatch—the duration is crucial for diagnosis.
If possible, record a video: A video is extremely helpful for classification.
After the seizure: A quiet, dimly lit environment. Postictal disorientation, hunger, and temporary blindness are normal.
Contact a veterinarian: If symptoms last longer than 5 minutes or occur in clusters, contact immediately; otherwise, contact the same day.

Common Mistakes & Myths

“Dog swallows its tongue”: Anatomically impossible. Don’t put anything in its mouth—risk of injury.
“A seizure is the same as epilepsy”: False. Only two unprovoked seizures occurring more than 24 hours apart define epilepsy (IVETF 2015).
“Splash water on the face immediately if a seizure occurs”: Pointless and dangerous. The dog is unconscious.
“CBD Cures Epilepsy”: McGrath et al. (2019) provide moderate evidence—not a substitute for veterinary treatment.
“A dog with epilepsy should not be trained”: Reducing stress is important, but keeping the dog occupied remains essential.

State of the art in 2026

The body of research on idiopathic epilepsy is robust. Phenobarbital and imepitoin are considered first-line anticonvulsants (Bhatti et al. 2015). Recent studies on cannabidiol (McGrath et al. 2019) show initial evidence of adjuvant efficacy—though the evidence is limited. Genetic research has identified gene variants in specific breeds (e.g., LGI2 in the Lagotto Romagnolo, Seppälä et al. 2011). The treatment of drug-resistant patients remains an open question.

Frequently Asked Questions

How long does a typical seizure last?

Generalized seizures usually last between 30 seconds and 2 minutes. Any seizure lasting longer than 5 minutes is considered status epilepticus and is a medical emergency.

How does a dog behave after a seizure?

Postictal phase with disorientation, fatigue, hunger, thirst, and sometimes temporary blindness—can last from minutes to hours. This is to be expected.

When is a seizure considered an emergency?

Seizure lasting >5 minutes, multiple seizures within 24 hours without recovery, first seizure at an atypical age, seizure following possible poisoning or trauma. Seek immediate veterinary care.

Can my dog with epilepsy lead a normal life?

With properly managed treatment, many dogs enjoy a nearly normal quality of life. The frequency and severity of the seizures are key factors.

Related terms

Sources & Further Reading

Berendt, M., Farquhar, R. G., Mandigers, P. J. J., et al. (2015). International veterinary epilepsy task force consensus report on epilepsy definition, classification and terminology in companion animals. BMC Veterinary Research, 11, 182.
De Risio, L., Bhatti, S., Muñana, K., et al. (2015). International veterinary epilepsy task force consensus proposal: diagnostic approach to epilepsy in dogs. BMC Veterinary Research, 11, 148.
Bhatti, S. F. M., De Risio, L., Muñana, K., et al. (2015). International Veterinary Epilepsy Task Force consensus proposal: medical treatment of canine epilepsy in Europe. BMC Veterinary Research, 11, 176.
Kearsley-Fleet, L., O'Neill, D. G., Volk, H. A., et al. (2013). Prevalence and risk factors for canine epilepsy of unknown origin in the UK. Veterinary Record, 172(13), 338.
McGrath, S., Bartner, L. R., Rao, S., et al. (2019). Randomized blinded controlled clinical trial to assess the effect of oral cannabidiol administration in addition to conventional antiepileptic treatment on seizure frequency in dogs with intractable idiopathic epilepsy. JAVMA, 254(11), 1301-1308.