DOGS · Symptom guide
Dog having seizures: what published veterinary cases reveal
A seizure in a dog is one of the scariest things an owner can witness. The good news is that the diagnostic framework vets use is well-established — and the right starting point depends a lot on the dog's age, breed, and what was happening right before the seizure.
In young dogs (under 1 year), congenital portosystemic shunts (liver shunts) and juvenile hypoglycemia are top suspects. In adult dogs (1-6 years), idiopathic epilepsy — a diagnosis of exclusion — is the most common single cause. In older dogs (>7 years), brain tumours (meningioma, glioma), vascular events (canine stroke), and meningoencephalitis of unknown origin (MUO) all rise sharply. At any age, toxin exposure (xylitol, marijuana, mycotoxins) and electrolyte disturbances need to be ruled out.
The cases below are real peer-reviewed reports of dogs presenting with seizures. Each one shows the workup pathway, the eventual diagnosis, and the treatment outcome.
When to see a vet now
- Cluster seizures — more than one in a 24-hour period.
- Any single seizure lasting longer than 5 minutes (status epilepticus).
- Seizures in a dog under 1 year, or over 7 years (less likely to be idiopathic epilepsy).
- Behaviour changes between seizures: pacing, confusion, head pressing.
- Known or suspected toxin exposure in the last 24 hours.
Real cases from the veterinary literature
A teaser of peer-reviewed reports our semantic search surfaces for this complaint. Click into any case for the full abstract — or run a personalised search with your pet's exact details.
- Treatment with gabapentin of 11 dogs with refractory idiopathic epilepsy.
The Veterinary record
Eleven dogs with severe epilepsy that didn't respond to standard treatments were given gabapentin to see if it could help reduce their seizures. These dogs were having frequent generalized tonic-clonic seizures despite being on other medications. After three months of gabapentin treatment, six of the dogs had at least a 50% reduction in the number of seizures they experienced e
- Epidemiological, clinical and pathological features of canine parvovirus 2c infection in dogs from southern Brazil
Pesquisa Veterinária Brasileira · BR
A group of dogs in southern Brazil showed signs of severe illness due to canine parvovirus type 2c (CPV-2c), which included symptoms like diarrhea, vomiting, and even convulsions. Some of these dogs were adults and had been vaccinated, which is unusual for this virus. Tests confirmed the presence of CPV-2c in all cases, highlighting the need for veterinarians to be aware of its
- Case Report: Cervical internal vertebral venous plexus thrombosis diagnosed using time-of-flight magnetic resonance angiography in a dog
Frontiers in Veterinary Science · 2026
A 13-year-old male Siberian Husky was brought in with severe neck pain, limping in his left front leg, and seizures. Tests showed he had a urinary tract infection and some blood abnormalities. Advanced imaging techniques, including a special MRI called time-of-flight magnetic resonance angiography (TOF-MRA), revealed a blockage in the veins of his neck, which was causing the sy
- Monocular ictal nystagmus in a dog: potentially a newly recognized focal seizure phenotype
Journal of Veterinary Internal Medicine · 2026
A 3-year-old male neutered toy Chinese crested powderpuff dog was brought to the vet after suddenly becoming less responsive and experiencing severe seizures. During the exam, the vet noticed unusual eye movements, including rapid movement in the left eye and misalignment of the right eye. Tests, including MRI and spinal fluid analysis, showed brain lesions and signs of inflamm
- Long-term antiepileptic therapy is often not required in dogs with insulin-induced hypoglycemic seizures: a multicenter retrospective study of 49 dogs.
Journal of the American Veterinary Medical Association · 2026
A 5-year-old mixed-breed dog experienced seizures after receiving insulin for diabetes, which caused dangerously low blood sugar levels. The dog was treated at an emergency clinic where its blood sugar was corrected, and only a small number of dogs in similar situations needed long-term medication to control seizures. Most dogs recovered well without ongoing treatment, and the
- Fatal canine metaldehyde poisoning in Southern Brazil
Brazilian Journal of Veterinary Pathology · 2026
A 4-month-old female Pit Bull was brought to the emergency vet after eating slug bait that contained metaldehyde, a substance that can be very toxic to dogs. Within minutes, she showed serious symptoms like extreme drooling, confusion, and seizures. Despite receiving intensive care, including medications and oxygen therapy, she sadly passed away just eight hours later. The vet
Frequently asked questions
- Is one seizure an emergency?
- A single, short (<2 minute) seizure with full recovery isn't usually an emergency at 2 AM — but it always warrants a vet visit within 24 hours for bloodwork. Cluster seizures, seizures over 5 minutes, or any seizure in a very young or very old dog ARE emergencies — go now.
- What tests will the vet run?
- Baseline: CBC, chemistry, bile acids (screens for liver shunt — especially in young/small dogs), and a fasting blood glucose. Beyond that, MRI of the brain and a CSF tap are the gold standard for ruling in or out structural causes (tumours, MUO). The case reports below show several diagnostic pathways.
- Will my dog need lifelong medication?
- Dogs diagnosed with idiopathic epilepsy and more than one seizure every 6 weeks (or any cluster) typically start phenobarbital, levetiracetam, or zonisamide. Many dogs go years between seizures on therapy. Dogs with a structural or metabolic cause are treated based on the underlying disease.