Managing Canine Epilepsy: What Seizures Mean and How to Support Your Dog

Understanding Seizures in Dogs

A seizure is an episode of abnormal, uncontrolled electrical activity in the brain. They can appear as generalized tonic-clonic events (the classic convulsive seizure with muscle rigidity, falling, paddling, and loss of consciousness), focal seizures (rhythmic movement of a single limb, facial twitching, or sudden behavioral changes), or atypical events that may look like fly-biting, sudden aggression, or disorientation. Epilepsy is the condition of recurring seizures; the first seizure in a dog always requires veterinary evaluation to determine whether it's idiopathic (primary epilepsy with no identifiable underlying cause) or symptomatic (caused by an underlying condition).

What to Do During a Seizure

During a seizure: stay calm. Move furniture and objects away from the dog to prevent injury. Do not restrain the dog or put your hands near their mouth — a seizing dog can bite reflexively, and seizures are not painful despite appearances. Time the seizure. After the seizure (post-ictal phase), the dog will be confused, disoriented, possibly blind, panting, and exhausted — this is normal and may last minutes to an hour. Call your veterinarian after any first seizure. Call an emergency vet immediately if: the seizure lasts more than 5 minutes (status epilepticus — a life-threatening emergency), or if there are multiple seizures within 24 hours (cluster seizures).

Diagnosis and Cause Determination

A minimum database (bloodwork, urinalysis) screens for metabolic causes. MRI and CSF analysis (cerebrospinal fluid tap) are needed to fully characterize the brain and rule out structural causes. Idiopathic epilepsy is the most common diagnosis in dogs under 5 years at first seizure. Breed predispositions: Border Collies, Australian Shepherds, German Shepherds, Belgian Malinois, Labrador and Golden Retrievers, and Beagles have elevated rates.

Anticonvulsant Therapy

Treatment is typically recommended when seizures are more frequent than once a month, are clustered, or are prolonged. Phenobarbital and potassium bromide are the first-line anticonvulsants in dogs; newer options (levetiracetam/Keppra, zonisamide) are used for refractory cases. Anticonvulsants require regular monitoring bloodwork (every 6 months typically) to check serum levels and organ function. Dogs on phenobarbital require liver function monitoring. Many dogs with epilepsy have good long-term quality of life with medication.