The first seizure is almost always terrifying for the owner. A dog that was fine a moment ago is suddenly on the floor, unconscious or nearly so, paddling its legs, salivating, perhaps vocalising. It lasts two minutes. It feels like twenty. By the time you arrive at the emergency clinic, the dog is standing up and looking at you as if to ask what all the fuss is about.
What happens next — what I tell the owner in that consultation room — shapes everything about how the condition is managed from that point on. I want to share that conversation here, because it’s one of the most important conversations in small animal neurology and it’s often rushed.
What a Seizure Actually Is
A seizure is a sudden, uncontrolled electrical discharge in the brain. In that moment, the brain essentially misfires — neurons fire simultaneously in a wave that disrupts normal function, causing the involuntary movements, altered consciousness, and other signs that owners recognise.
Seizures are not a diagnosis in themselves. They are a symptom. Something caused that abnormal electrical discharge, and identifying what it is determines the prognosis and the treatment.
The causes of seizures in dogs fall into three broad categories: structural brain disease (tumours, inflammation, malformations, previous injury), metabolic problems that affect how the brain functions (liver disease, low blood sugar, electrolyte disturbances, toxin exposure), and idiopathic epilepsy — which is the diagnosis I’ll spend the most time on, because it’s the most common cause of seizures in young to middle-aged herding breeds.
Why Herding Breeds Feature in This Conversation
Idiopathic epilepsy — seizures with no identifiable structural or metabolic cause, presumed to be genetically driven — is genuinely more prevalent in several herding breeds than in the general dog population.
German Shepherds are among the most commonly affected breeds. Studies from tertiary referral centres consistently show them over-represented in the epilepsy caseload relative to their frequency in the general population. The genetic basis is almost certainly polygenic and complex, but the breed predisposition is not in doubt.
Border Collies have a well-documented form of epilepsy called border collie collapse or exercise-induced collapse — though this is distinct from classic grand mal epilepsy, it falls within the broader category of episodic neurological disorders specific to herding breeds.
Australian Shepherds have both conventional idiopathic epilepsy and breed-specific episodic syndromes. Belgian Malinois used in working contexts have elevated rates compared to many other breeds, though the data here is less robust than for German Shepherds.
The Workup After a First Seizure
The first thing I tell owners after a first seizure is this: one seizure alone does not necessarily mean your dog has epilepsy. And even if it does, a single seizure in an otherwise healthy dog may not require immediate treatment.
What it does require is proper investigation.
Blood work is the first step. A comprehensive metabolic panel checks for the conditions that can cause seizures from the outside, so to speak — liver dysfunction, low blood glucose, electrolyte abnormalities, kidney disease. These need to be excluded before the diagnosis of idiopathic epilepsy can be made. A dog having seizures from a liver shunt needs completely different management from a dog with genetic epilepsy.
Age and breed context matters. The typical age of onset for idiopathic epilepsy in dogs is between one and five years. A German Shepherd with a first seizure at three years old, with normal blood work, has a very high probability of idiopathic epilepsy. A German Shepherd with a first seizure at nine years old is more likely to have a structural problem — a tumour, inflammatory brain disease, or vascular event — and warrants more aggressive investigation. Age guides my index of suspicion significantly.
MRI and spinal fluid analysis. For dogs where the clinical picture warrants it — older onset, unusual seizure types, seizures that don’t fit the typical pattern, or dogs with neurological signs between seizures — I will recommend referral for MRI and cerebrospinal fluid analysis. This is the definitive way to identify or exclude structural brain disease. It’s not indicated for every dog with a first seizure and normal blood work; it’s essential for dogs where the diagnosis is uncertain.
Understanding “Idiopathic Epilepsy”
When I use the term idiopathic epilepsy with clients, I try to be transparent about what it means and what it doesn’t mean.
Idiopathic means we haven’t found a cause. In practical terms, for a young German Shepherd with normal blood work and MRI showing no structural abnormality, it almost certainly means genetic epilepsy — the same condition that has been identified in the breed for decades. But “idiopathic” is technically a diagnosis of exclusion, and I think owners deserve to understand that.
What it doesn’t mean is hopeless or unmanageable. Most dogs with idiopathic epilepsy in herding breeds can be managed well. Many go extended periods without seizures. Some, with appropriate medication, stop having seizures entirely. A proportion — I would say perhaps a quarter to a third of the dogs I see in referral practice — are difficult to control and require complex polypharmacy. That’s the honest range.
The condition is lifelong. Medication, once started, is typically continued long-term. Abrupt discontinuation of antiepileptic drugs can precipitate severe breakthrough seizures or status epilepticus — prolonged seizures that are genuinely life-threatening. This is one of the most important things I tell new epilepsy owners: never stop the medication without veterinary guidance, even if your dog has been seizure-free for a year.
The Treatment Decision
Not every dog with a seizure disorder needs immediate medication. This surprises many owners, because their instinct — entirely understandably — is to do something, to intervene.
The current consensus in veterinary neurology supports starting antiepileptic medication when seizures occur more than once every four to six weeks, when seizures occur in clusters (multiple seizures within twenty-four hours), when individual seizures are severe or prolonged, or when the dog takes more than twenty-four hours to recover normally after a seizure.
A young Border Collie having one brief tonic-clonic seizure every three or four months, with rapid recovery and normal behaviour between episodes, is a dog I may monitor closely before committing to lifelong medication. The decision is made in partnership with the owner, with full information about what each path involves.
Phenobarbital remains the first-line treatment for idiopathic epilepsy in dogs. It works in the majority of patients, is relatively inexpensive, and has decades of safety data. The downsides are real: liver monitoring is required because of long-term hepatic effects, sedation in the early weeks of treatment is common, and appetite often increases substantially — which matters in a breed like the working shepherd that needs careful weight management.
Imepitoin (Pexion) is a newer option with a gentler side effect profile, licensed specifically for idiopathic epilepsy in dogs. Evidence suggests it’s somewhat less effective than phenobarbital in controlling seizures but may be preferable in dogs where liver concerns are present or where sedation is a significant problem. I use it increasingly as a first-line agent in dogs where the seizure frequency is lower and the response to phenobarbital’s side effects is likely to affect quality of life.
Potassium bromide is used as an add-on agent when single-drug therapy is insufficient. It’s effective but slow — therapeutic levels take weeks to establish — and it has its own side effects, including significant sedation at higher doses.
MDR1 and drug considerations. This is a point I want to flag specifically for herding breeds. Dogs with the MDR1 gene mutation — common in Collies, Australian Shepherds, and other herding breeds — may have altered drug metabolism for certain antiepileptic medications. Phenobarbital itself is not directly affected by the MDR1 mutation in the same way that some other drugs are, but if your dog is being investigated for epilepsy and their MDR1 status is unknown, this is the time to test it — before adding any medication whose handling might be influenced by the mutation.
Managing the Day-to-Day Reality
Owners of epileptic herding breeds adjust their lives in ways that become second nature quite quickly. Certain things I advise routinely:
Keep a seizure diary. Date, time, duration, character of the seizure, recovery time. This is clinically valuable — it tells me whether medication is working, whether seizures are clustering, and whether there are temporal patterns (time of day, proximity to meals, heat, exercise). More than that, it gives owners a sense of agency over something that often feels completely outside their control.
Identify triggers if possible. Not every epileptic dog has clear triggers, but some do. Fatigue, intense excitement, disrupted sleep, and sometimes extreme exertion or heat can lower the seizure threshold. If a pattern emerges, managing around it reduces seizure frequency.
First aid for a seizure. Move sharp objects away. Don’t put your hands in the dog’s mouth — they cannot swallow their tongue and you will be bitten. Time the seizure. If it continues beyond five minutes, or if there are multiple seizures within an hour, treat it as an emergency and get to a vet immediately.
Know what status epilepticus looks like. A seizure that doesn’t stop, or clusters of seizures where the dog doesn’t regain normal consciousness between episodes, is a medical emergency. It causes brain damage, generates dangerous hyperthermia, and can be fatal if untreated. Every epileptic dog owner should have an emergency rectal diazepam or nasal midazolam prepared and know how to use it. This is something I prescribe routinely.
What the Long-Term Looks Like
I want to be honest rather than falsely reassuring.
Most herding breed dogs with idiopathic epilepsy, treated appropriately, have a good quality of life. They can exercise, play, work, bond deeply with their families. A dog whose seizures are controlled on medication isn’t a sick dog — it’s a dog managing a chronic condition with medical support.
A minority — perhaps fifteen to twenty percent in the practices I’ve been part of — prove genuinely refractory to medication. Multiple drug combinations, escalating doses, continued breakthrough seizures. For these dogs, quality of life becomes the central management question, and sometimes the honest conversation involves acknowledging that the burden of uncontrolled seizures is affecting the dog’s wellbeing in ways that need addressing.
For dogs on long-term antiepileptics, the annual wellness exam becomes even more important than usual. Liver function monitoring every six to twelve months, body weight monitoring, assessment of behaviour and cognitive function. These dogs benefit from consistent veterinary oversight in a way that goes beyond the basics.
The genetic component means breeding decisions matter. Epileptic dogs should not be bred. Dogs that produce epileptic offspring in multiple litters probably shouldn’t be bred again. The herding breed communities that take this seriously have seen genuine improvement in epilepsy rates over the decades; those that don’t continue to produce dogs with the same problems.
The Question Owners Always Ask
“Will my dog be okay?”
Most of the time, yes. Not because epilepsy is trivial — it isn’t — but because most dogs with idiopathic epilepsy, properly diagnosed and managed, find a stable equilibrium on medication and live good lives. The first seizure is the most frightening thing. The adjustment to managing a dog with epilepsy is harder than the actual day-to-day reality, once you’ve been doing it for a few months.
Keep the diary. Take the medication seriously. Know what an emergency looks like. And come back to your vet when something changes rather than waiting until it gets bad.
That’s the conversation I have in the room after that first seizure. It’s not as frightening as it feels in the moment. But it requires your attention.
Frequently Asked Questions
Is epilepsy common in German Shepherds?
Yes. German Shepherds are among the breeds with the highest rates of idiopathic epilepsy in veterinary caseloads. The genetic basis is not fully characterised but the predisposition is well-established. First seizures typically occur between one and five years of age.
Does my epileptic herding breed need an MRI?
Not necessarily for every dog. A young dog with a classic presentation, normal blood work, and seizures fitting the pattern of idiopathic epilepsy may be managed without MRI. An older dog with a first seizure, unusual seizure types, or abnormal neurological signs between episodes should be referred for advanced imaging.
Can I stop the medication if my dog hasn’t had a seizure for a year?
No, not without veterinary guidance. Abrupt discontinuation of antiepileptic drugs can cause severe rebound seizures or status epilepticus. If you want to explore dose reduction after a prolonged seizure-free period, that decision needs to be made with your vet and done gradually under monitoring.
What should I do during a seizure?
Keep the dog away from hard surfaces and sharp objects. Do not put your hands in their mouth. Time the seizure. If it lasts more than five minutes or the dog has multiple seizures without recovering consciousness between them, treat it as an emergency. Otherwise, stay calm, protect the dog from harm, and let the seizure run its course.
Does MDR1 status affect epilepsy medication in herding breeds?
Phenobarbital, the most common first-line antiepileptic, is not significantly affected by the MDR1 mutation. However, some drugs used in seizure management can be. Know your dog’s MDR1 status before starting treatment, and discuss it with your vet to ensure medication choices are appropriate.