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. 🐾❤️