💉 Endocrinology

Dog Insulin Dosage Calculator

Evidence-based starting dose and adjustment guidance for canine diabetes mellitus, sourced from veterinary internal medicine literature.

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Medical Alert: Insulin is a life-critical medication. This calculator provides educational starting-dose estimates only. Canine diabetes requires individualised management, regular blood glucose curves, and close veterinary supervision. Never adjust insulin dose without consulting your veterinarian.

🐶 Introduction

Diabetes mellitus in dogs is most commonly insulin-dependent (Type 1 equivalent), caused by immune-mediated destruction of pancreatic beta cells, often secondary to pancreatitis, hyperadrenocorticism, or prolonged progesterone exposure. Affected dogs require lifelong exogenous insulin therapy to maintain euglycemia.

Initial dosing is weight-based, with subsequent adjustment guided by serial blood glucose curves performed 7–14 days after each dose change. The therapeutic target is a glucose nadir of 80–150 mg/dL and a pre-insulin glucose of 150–300 mg/dL.

📚 Insulin Types & Starting Doses

Vetsulin® (Porcine Lente Insulin) — FDA-approved for dogs

Starting dose: 0.5 IU/kg SC q12h. Duration of action: 10–14 hours. This is the first-line choice for newly-diagnosed diabetic dogs per ACVIM consensus guidelines (2018).

NPH Insulin (Humulin N / Novolin N)

Starting dose: 0.5 IU/kg SC q12h. Duration: 10–16 hours. Used when Vetsulin is unavailable or cost is prohibitive.

ProZinc® (Protamine Zinc Recombinant Human Insulin)

Starting dose: 0.2–0.3 IU/kg SC q12h. Duration: 14–24 hours. May suit dogs with longer glucose curves. Lower starting dose reduces hypoglycaemia risk.

Glargine / Detemir (Basal Analogues)

Starting dose: 0.25–0.5 IU/kg SC q12h. Less commonly used in dogs vs. cats. Considered when other insulins provide inadequate control.

Dose Adjustment Principles

  • Adjust in increments of 0.5–1 IU per injection (not by percentage in early management).
  • Allow 7–14 days between adjustments to assess full effect.
  • If nadir < 80 mg/dL → reduce dose by 10–20%.
  • If pre-insulin glucose > 350 mg/dL & nadir > 200 mg/dL → increase dose by 10–25%.
  • Always perform a blood glucose curve (7–8 readings over 12h) before adjusting.

📋 How to Use

  1. Enter your dog’s current body weight in kg or lb.
  2. Select the insulin type prescribed by your vet.
  3. Enter the pre-injection blood glucose if available (for adjustment guidance).
  4. Select whether this is an initial dose or a dose adjustment.
  5. Click Calculate — results show dose in IU, syringe units (U-40 and U-100), and adjustment context.

💉 Insulin Dose Calculator






IU per injection (twice daily)

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Hypoglycaemia is a medical emergency. If your dog shows weakness, tremors, seizures, or unresponsiveness, rub Karo syrup or honey on gums and get to an emergency vet immediately. Keep emergency glucose gel at home at all times.

📖 References & Methodology

  1. Behrend E, et al. Diagnosis of spontaneous canine hyperadrenocorticism. J Vet Intern Med. 2013.
  2. Nelson RW, Couto CG. Small Animal Internal Medicine, 5th ed. Elsevier, 2014. Ch. 52: Diabetes mellitus.
  3. Fleeman LM, Rand JS. Management of canine diabetes. Vet Clin North Am Small Anim Pract. 2001;31(5):855-880.
  4. ACVIM Consensus Statement: Diagnosis and management of canine diabetes mellitus. J Vet Intern Med. 2018.
  5. Plumb DC. Plumb’s Veterinary Drug Handbook, 9th ed. Wiley-Blackwell, 2018. Insulin entries.