FR
ENWhat is canine epilepsy?
Epilepsy results from an abnormal electrical discharge in the cerebral cortex, a sudden, uncontrolled burst of neuron activity that triggers temporary clinical signs. There are several types, and understanding which one affects your dog is the first step toward effective management.
Causes: primary vs secondary
Primary causes (intracranial)
The source is within the brain itself: brain tumor, stroke, congenital malformation, encephalitis. Advanced imaging (MRI) is often needed to detect these.
Secondary causes (extracranial)
The source is elsewhere in the body: metabolic disorders (diabetes, liver or kidney failure), ingested toxins, tick-borne infectious diseases. Blood and urine workup is key.
Focal seizures
Only a limited area of the cortex is involved. The dog remains conscious but shows localized signs: drooling, movement of one limb, sudden vocalizations, brief aggression, disorientation.
Generalized seizures
The entire cortex is involved. Typically: loss of consciousness, convulsions of all four limbs, muscle stiffness, heavy drooling, loss of urine or stool. The most common form in dogs.
Idiopathic epilepsy
The most common form: no identifiable cause is found despite a complete workup. It often affects dogs aged 1 to 5 years and has a strong genetic component in certain breeds (German Shepherd, Golden Retriever, Labrador, Border Collie, Beagle…). It typically manifests as recurrent generalized seizures.
The 3 phases of an epileptic seizure
Every seizure follows a three-part pattern. Recognizing them helps you stay calm, act effectively, and give your veterinarian invaluable information.
Pre-ictal phase
- Anxiety, unexplained restlessness
- Excessive panting
- Seeking contact or conversely hiding
- Fixed, absent stare
- Mild trembling
Ictal phase
- Convulsions, uncontrolled movements
- Loss of consciousness (generalized seizures)
- Muscle rigidity or paddling of the limbs
- Heavy drooling, teeth grinding
- Loss of urine, stool, or anal gland expression
Post-ictal phase
- Lethargy, prolonged drowsiness
- Disorientation, confusion
- Intense hunger or thirst
- Ataxia (wobbly gait)
- Temporary blindness (rare)
Progression signs and warning signals
Beyond the seizures themselves, certain signs indicate the disease is progressing or that a serious underlying cause is present.
Signs of epilepsy progression
- Increasing seizure frequency
- Greater seizure intensity
- Longer post-ictal recovery period
- Progressive withdrawal and isolation
- Sudden clinginess ("velcro dog" behavior)
- Unusual aggression between episodes
- Weight loss
- Disorientation or memory changes
Signs that may indicate a brain lesion
- Significant weakness or fatigue
- Confusion, persistent depressed state
- Head tilt
- Loss of balance, falling
- Reduced or lost vision
- Circling or pressing against walls
- Personality changes or new aggression
- Significant weight changes
When to go to an emergency vet immediately?
These situations require immediate veterinary emergency care:
- Seizure lasting more than 5 minutes (status epilepticus): risk of hyperthermia and permanent brain damage
- Cluster seizures: more than 3 seizures within 24 hours
- Breathing difficulty during or after the seizure
- Bluish mucous membranes (cyanosis): oxygen deficit
- Inability to stand or walk after the seizure, sudden collapse
- Severe uncontrollable agitation or aggression after the seizure
During a seizure: what to do?
Do
- Stay calm and time the seizure duration
- Move dangerous furniture away (protect the head with a folded towel)
- Dim lights, reduce noise
- Film discreetly if possible (invaluable for your vet)
- Note start and end time
- Stay present, speak softly
Never do
- NEVER put anything in the dog's mouth, they cannot swallow their tongue
- Do not physically restrain the dog (risk of bite and worsening)
- Do not pour water on them
- Do not let other animals approach
How is the diagnosis made?
The diagnosis of epilepsy is primarily clinical, based on the dog's history. Additional tests identify the underlying cause.
Seizure history and observation
Duration, frequency, appearance (movements, consciousness, post-ictal phase…). Your notes and videos are invaluable, the vet will never see a seizure in real time.
Full blood and urine panel
Biochemistry, hematology, liver and kidney function, thyroid hormones, urinalysis. To rule out all extracranial causes (metabolic, toxic, infectious).
Infectious disease testing
Tick-borne diseases (neosporosis, toxoplasmosis, anaplasmosis…) based on the dog's risk profile.
Advanced imaging (MRI / CT scan)
Recommended if bloodwork is normal or if neurological signs between seizures suggest an intracranial lesion (tumor, hematoma, malformation). Performed under general anesthesia.
Veterinary neurology consultation
For complex cases (frequent seizures, treatment resistance, suspected tumor), a veterinary neurologist can deepen the workup and propose specialized management.
Treatment and management: a tailored approach
There is no one-size-fits-all protocol. Treatment is adapted to the cause, seizure frequency, and individual response.
- Brain tumor: surgery and/or radiotherapy depending on type and location.
- Metabolic disorders: diabetes management, hepatic or renal support, supplementation for deficiencies.
- Toxins: decontamination and supportive care.
- Infection: targeted antibiotics or antiparasitics.
- Phenobarbital: gold-standard molecule, very effective. Requires regular blood monitoring (drug levels + liver panel).
- Potassium bromide: often added when phenobarbital alone is insufficient.
- Levetiracetam, zonisamide: modern alternatives, better tolerated in some cases.
- Indication: generally started if more than one seizure per month, or severe/cluster seizures.
- Blood tests: every 3 to 6 months to monitor drug levels and detect side effects.
- Gradual tapering only: never stop an antiepileptic suddenly : risk of rebound seizures, often more severe.
- Trigger management: identify and minimize stress situations known to trigger seizures.
What to expect long-term?
Prognosis depends largely on the cause and response to treatment. In most cases, a good quality of life is entirely achievable.
With an adapted protocol and rigorous follow-up, most epileptic dogs maintain an excellent quality of life. Treatment is often lifelong, but it gradually becomes part of everyday routine.
Home management : the owner's key role
Keeping a seizure journal
It is the most valuable tool you can give your veterinarian. Record at each episode:
What to do
- Strictly follow medication schedules and doses
- Avoid or minimize stressful situations (unnecessary travel, loud children)
- Dog-proof the environment: limit access to stairs and water without supervision
- Set up soft bedding in a quiet corner
- Use calming pheromones (Adaptil®) or supplements if recommended
- Monitor appetite, weight, and energy level
- Encourage moderate physical activity if tolerated
- Brief family, neighbours, or pet-sitter on the emergency protocol
- Continue routine preventive care (vaccines, deworming)
What not to do
- Stop an antiepileptic without veterinary advice, even if everything seems fine
- Adjust the dose on your own initiative
- Leave the dog unattended near a staircase or pool
- Ignore an increase in seizure frequency or intensity
Frequently asked questions
My dog just had their first seizure: does that mean epilepsy?
Can my dog die during a seizure?
Does antiepileptic treatment have to last forever?
Is phenobarbital dangerous for the liver?
Can my epileptic dog have a normal life?
Should I see a veterinary neurologist?
This guide is provided for informational and educational purposes only. It does not constitute veterinary medical advice and is not a substitute for a consultation with a qualified veterinarian. Every animal is unique and their health must be evaluated individually. If you have concerns about your pet's health, contact your veterinarian promptly.