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.
- Magnetic resonance imaging, clinicopathologic findings, and clinical progression of a puppy with confirmed Eastern equine encephalitis virus.
The Canadian veterinary journal = La revue veterinaire canadienne · 2021 · United States
A 5-month-old puppy was taken to the vet because it was showing serious signs of neurological problems and had a fever. Tests, including an MRI, showed that the puppy had swelling in the brain and some parts of the brain were pushing down into the spinal canal, which is very concerning. A test of the fluid around the brain showed a lot of cells, and unfortunately, the puppy had
- Bifenthrin Fatality in a Canine: A Case Report with Postmortem Concentrations.
Journal of analytical toxicology · 2019 · United States
A 5-year-old female spayed Pit Bull Terrier became very sick and sadly died after being exposed to a type of insecticide called bifenthrin. The dog was left alone for about 15-20 minutes before her owner found her lying on her side and having what looked like a seizure. She was taken to an emergency vet, where she had a fast heartbeat, trouble breathing, and severe shaking or s
- Review of idiopathic eosinophilic meningitis in dogs and cats, with a detailed description of two recent cases in dogs.
Journal of the South African Veterinary Association · 2008
Eosinophilic meningoencephalitis (EME) is a condition that affects the brain and spinal cord, and it has been seen in dogs and cats, often without a clear cause. In this study, two cases of young male dogs were examined after they showed serious neurological symptoms. The first dog, an 18-month-old Boerboel, had trouble coordinating his movements and some nerve issues for two w
- Acrylic cranioplasty and axial pattern flap following calvarial and cerebral mass excision in a dog.
Australian veterinary journal · 2002 · Australia
A 4 kg Chihuahua was brought to the vet because he was having seizures and had a large mass on the top of his head. This mass had come back after being removed twice before and was identified as a type of bone tumor called a multilobular osteochondroma. A CT scan showed that the mass was damaging the bones of the skull and pressing on the brain. The veterinarians performed surg
- Zoonotic roundworm infections.
Infectious disease clinics of North America · 1993
Some types of roundworms that commonly infect dogs can also infect humans, leading to serious health issues. For example, the roundworm Toxocara canis can cause problems like eye and organ damage. Recently, doctors have found that these infections can also be linked to issues like learning difficulties, seizures, asthma, stomach pain, and long-lasting allergies. Treating these
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.