Insulinoma in Dogs: Vet’s 2025 Guide to Signs, Diagnosis & Care 🐾💉

By Dr. Duncan Houston BVSc

Hello—I’m Dr Duncan Houston BVSc, veterinarian and Ask A Vet founder. Insulinoma is a tumor of the pancreas' beta cells that produces excessive insulin, leading to recurrent hypoglycemia. Although rare, it’s the most common pancreatic tumor in dogs. In this vet‑approved guide, I explain:

How insulinomas develop and cause low blood sugar
Key clinical signs like lethargy, wobbling, seizures, collapse
Diagnostic steps: blood tests, imaging, staging
Treatment: surgery, medical management, diet
Prognosis and home care strategies, including Ask A Vet tracking tools

1. What Is an Insulinoma?

An insulinoma is a pancreatic beta‑cell tumor that secretes insulin inappropriately—even when blood sugar is low—causing persistent hypoglycemia. Over 95% are malignant by the time of diagnosis.

2. Who Gets It & Why?

Typically middle‑aged to older dogs (~9 yrs; 3–15 yrs)
Breed predispositions: German Shepherds, Goldens, Boxers, Labs, Collies, Poodles, Setters
No strong sex or clear underlying cause

3. Clinical Signs

Lethargy, weakness, clown‑like gait, pale gums, nausea
Seizures, tremors, collapse—often exercise or fasting related
Ongoing hypoglycemic episodes especially in advanced disease

4. Diagnosing the Condition

Test glucose (<60 mg/dL) with high insulin levels confirms diagnosis
Imaging: ultrasound & CT to locate masses and assess spread
Staging: Stage I pancreas only; Stage II includes lymph nodes; Stage III includes liver or other organs

5. Treatment Strategies

🛠️ Surgery

Best option for Stage I & II. Offers greatest survival benefit
Risks include bleeding, need for staging, possible difficulty finding small tumors

💊 Medical Management

Frequent small meals with complex carbs to stabilize blood sugar
Medications: prednisone, diazoxide, somatostatin analogues to support glucose
Supplements: glucose gel (Karo), Nutri‑Cal for crisis support

🔬 Additional Treatments

Chemo and radiation are less common but used in certain cases

6. Prognosis & Survival

Stage I–II with surgery: ~12–18 months survival
Stage III or inoperable: median survival ~6–9 months
Recurrence of hypoglycemia is common—even after surgery

7. Home Care & Ask A Vet Support

Track appetite, seizures, activity and glucose via Ask A Vet app tools.
Schedule regular vet checks and glucose testing.
Prepare emergency protocols: keep glucose gel handy.
Maintain stable, small frequent meals and avoid prolonged fasting.

📌 Final Thoughts from a Vet

Insulinoma is a serious but manageable condition with early detection, surgery, medical support, and consistent monitoring. Many dogs live quality lives for over a year post-treatment. Using Ask A Vet’s tracking toolkit, glucose reminders, and vet consultations makes care more organized and supportive. You’re not alone—our app and team are here to guide you step-by-step. 🐾❤️

© 2025 Dr Duncan Houston BVSc, Ask A Vet founder. Want an insulinoma care checklist, seizure and glucose diary, or rice‑complex carb diet guide? Just say the word!