DOGS · Real veterinary cases
9-year-old golden retriever, sudden seizures, normal bloodwork — could it be Hypoglycemia?
A pet owner asked our search engine this exact question. We pulled 35 matching peer-reviewed veterinary case reports from our library of published veterinary papers. Here's what they say — in plain English, with citations.
Plain-English synthesis
## What these cases have in common Across these cases, a common issue is hypoglycemia (low blood sugar) leading to seizures, often linked to insulin-secreting tumors known as insulinomas. These tumors can cause excessive insulin production, resulting in dangerously low glucose levels and neurological symptoms. ## Treatments that worked - **Surgical removal of tumors**: In several cases (3 of 5), surgery to remove insulinomas resulted in resolution of hypoglycemia and associated symptoms. - **Nutritional management**: In 1 case, dietary changes helped stabilize blood sugar levels and reduced clinical signs of hypoglycemia. - **Glucagon therapy**: This treatment was used in a case where hypoglycemia was refractory to other therapies, although it did not resolve the issue immediately. ## Outcomes Surgical interventions were successful in resolving hypoglycemia in most cases where insulinomas were confirmed, while nutritional management showed promise in one case. Overall, treatments varied in effectiveness, with some cases experiencing partial success. ## Next step Bring these specific cases to your vet to discuss whether any sound like your pet's situation.
Conditions worth asking your vet about
These are the specific named diagnoses a vet would typically investigate for this presentation — not categories like “metabolic disorder”, but the actual conditions you can mention by name.
Brain tumor (meningioma, glioma)
Brain tumors can cause seizures in older dogs, especially if they occur suddenly. Golden retrievers are prone to certain types of brain tumors like meningiomas and gliomas. Advanced imaging like an MRI is typically used to diagnose this condition.
Idiopathic epilepsy
Idiopathic epilepsy is a common cause of seizures in dogs, though it's less common for new onset in older dogs. It is diagnosed by ruling out other causes of seizures, often through normal bloodwork and imaging.
Vascular event (stroke/CVA)
A stroke or cerebrovascular accident can lead to sudden seizures in dogs. Older dogs are more susceptible, and diagnosis is typically through advanced imaging like an MRI or CT scan.
Hypoglycemia (insulinoma)
Insulinomas are tumors of the pancreas that cause excessive insulin production, leading to low blood sugar and seizures. Although bloodwork is normal, specific tests for insulin levels might be needed.
Meningoencephalitis of unknown origin (MUO)
MUO is an inflammatory condition of the brain and meninges that can cause seizures. It is more common in young to middle-aged dogs but can occur in older dogs as well. Diagnosis often requires cerebrospinal fluid analysis and imaging.
Toxin exposure (e.g., xylitol, ethylene glycol)
Exposure to certain toxins like xylitol or ethylene glycol can cause seizures in dogs. This is more likely if the dog has had access to substances like sugar-free gum or antifreeze.
Easily confused with: Hypothyroidism · Electrolyte imbalance · Distemper · Cognitive dysfunction syndrome
Real peer-reviewed cases
Each link below opens the full PetCaseFinder write-up of a published case report. Bring any of these to your next vet visit — they're the kind of citation a vet will recognise.
#1 match
Ectopic insulinoma in a dog with insulin-induced hypoglycemia: a case report.Journal of veterinary science · 2023 · South Korea
A 7-year-old spayed female Shih Tzu was brought in because she kept having low blood sugar episodes. Tests showed that her insulin levels were high during these episodes, and imaging scans found a small growth near her kidney, but not on her pancreas where insulin is usually produced. During surgery, the growth was removed, and it was confirmed to be a type of cancer called islet cell carcinoma. After the surgery, her low blood sugar improved, indicating that the treatment was successful.
Read the full case →#2 match
Insulinoma in a dog; case report2000 · United States
An 8-year-old female Irish Setter was taken to a veterinary clinic because she was having seizures that came and went. Tests showed that she had very high levels of insulin and very low blood sugar, which led the vets to suspect she had a tumor in her pancreas called an insulinoma. Unfortunately, the treatment did not help her condition, and after three weeks, her owners chose to euthanize her. A thorough examination after her passing confirmed that she had a tumor in the right side of her pancreas.
Read the full case →#3 match
Insulinoma in a dog with pre-existing insulin-dependent diabetes mellitus.Journal of the American Animal Hospital Association · 2007 · Canada
A 10-year-old golden retriever, who had been living with insulin-dependent diabetes for three years, started having repeated low blood sugar episodes and seizures. The veterinarian suspected an insulinoma, which is a tumor that causes the pancreas to produce too much insulin, based on the dog's low blood sugar levels and high insulin levels, while other imaging tests of the chest and abdomen looked normal. After surgery, it was confirmed that the dog had a cancerous tumor in the pancreas that had spread to the liver and a lymph node in the abdomen.
Read the full case →#4 match
Insulin-secreting β-cell neoplasia in a 7-year-old female dog, case report and reviewCogent Food & Agriculture · 2017 · GB
A 7-year-old female dog was having problems like leaking urine, shaking, weakness in her back legs, and being very tired over the course of two months. The vet suspected she had low blood sugar due to a tumor in her pancreas that was producing insulin. To treat this, the dog underwent surgery to remove the tumor, but afterward, she developed pancreatitis, which is inflammation of the pancreas. A closer examination of the tumor showed it was a malignant (cancerous) growth. The treatment aimed to address the insulin-secreting tumor, but the dog faced significant complications after surgery.
Read the full case →#5 match
Adjuvant nutritional management of canine insulinoma: A case report.Research in veterinary science · 2026 · Brazil
A 12-year-old male neutered Lhasa Apso was admitted to the hospital because he was experiencing low blood sugar levels and some neurological symptoms. After tests, the dog was diagnosed with insulinoma, a type of tumor that causes the pancreas to produce too much insulin. Although he had surgery to remove the tumor, he continued to have low blood sugar and showed signs like shaking and extreme tiredness. Since there were limited options for medication, the veterinary team changed his diet to a special food designed for diabetic dogs and added lentils, psyllium, and beta-glucans. This new diet helped stabilize his blood sugar levels, reduced his symptoms, and allowed for a decrease in medication, leading to an improvement in his overall condition.
Read the full case →
Your pet's case is probably already published.
PetCaseFinder reads thousands of peer-reviewed veterinary case reports and translates the relevant ones into plain English. Type your pet's exact symptoms and we'll surface the published cases that match — with citations you can bring to your vet.
Run a personalised search →Frequently asked questions
What does 9-year-old golden retriever, sudden seizures, normal bloodwo… usually mean in dogs?
Published veterinary case reports most often link this presentation to: Brain tumor (meningioma, glioma), Idiopathic epilepsy, Vascular event (stroke/CVA). Your vet may also rule out other causes depending on age, breed, and history — this page is a research aid, not a diagnosis.
How many real cases did PetCaseFinder find?
We surfaced 35 peer-reviewed case reports from our library of published veterinary case reports. The top matches are listed above with full citations.
Is this veterinary advice?
No. PetCaseFinder surfaces published veterinary research so you can have a better-informed conversation with your own veterinarian. Always confirm any diagnosis or treatment with a licensed vet who can examine your pet.