Seizures in Pets: Causes, First Aid & Long-Term Management
Watching your pet seize is terrifying. Understanding why seizures happen and how to respond can save their life.
A seizure is a sudden, uncontrolled burst of electrical activity in the brain. Seizures are one of the most common neurological emergencies in veterinary medicine. While frightening to witness, most seizures are not immediately life-threatening — though prolonged seizures require emergency intervention.
Key Points
- Seizures lasting more than 5 minutes (status epilepticus) are a life-threatening emergency
- Idiopathic epilepsy is the most common cause in dogs aged 1-5 years
- Brain tumors are the leading cause of seizures in dogs over 7 years
- Hypoglycemia, liver disease, and toxins can cause metabolic seizures
- Phenobarbital and potassium bromide are first-line anticonvulsants
- Most epileptic dogs live normal lives with well-controlled seizures
Types of Seizures
Generalized (grand mal) seizures affect the entire brain and body. The pet collapses, becomes unconscious, and has rhythmic paddling movements of the limbs. Urination and defecation often occur. The head may arch backward. Focal (partial) seizures affect only one area — facial twitching, repetitive leg movements, or unusual behavior. Psychomotor seizures cause complex behaviors like fly-biting, chasing the tail, or aggression. Cluster seizures are multiple seizures within 24 hours. Status epilepticus is a continuous seizure lasting more than 5 minutes.
Identifying the Cause
Idiopathic epilepsy is genetic and diagnosed by excluding other causes — common in Beagles, German Shepherds, Border Collies, and Golden Retrievers. Structural brain disease (tumors, strokes, inflammation) is more likely in older dogs. Metabolic causes include hypoglycemia, liver shunts, hypocalcemia, and uremia. Toxic causes include chocolate, xylitol, strychnine, and organophosphates. Infectious causes include distemper, rabies, and toxoplasmosis.
First Aid During a Seizure
Stay calm. Note the start time. Move furniture away to prevent injury. Do NOT put your hand in the pet's mouth — they may bite involuntarily. Turn off lights and minimize noise. Time the seizure. If it lasts more than 5 minutes, or if multiple seizures occur within an hour, seek emergency veterinary care immediately. After the seizure ends, the pet enters the post-ictal phase — disoriented, restless, blind, or hungry. This can last minutes to hours.
Long-Term Management
Daily anticonvulsant medication is needed for dogs with frequent seizures (more than 1 every 2-3 months). Phenobarbital is the most commonly used first-line drug. Potassium bromide is often added if phenobarbital alone is insufficient. Levetiracetam (Keppra) is increasingly popular due to fewer side effects. Zonisamide and diazepam are additional options. Blood levels of phenobarbital are monitored every 6 months. Most epileptic dogs achieve good control and live normal lifespans.
When to See a Vet Immediately
- A seizure lasts more than 5 minutes
- Multiple seizures occur within one hour
- This is your pet's first seizure
- Seizures are becoming more frequent or severe
- The post-ictal phase (confusion after seizure) lasts more than 24 hours
How RVC Can Help
This article is for educational purposes only and does not replace professional veterinary advice. If your pet is showing any symptoms, please contact Royal Veterinary Center immediately at +853 6677 6611.