Dog Insulin Calculator
Veterinary review by Gabriel A. Sánchez Barreras, DVM — October 2026
Educational canine insulin reference. Shows commonly cited weight-based starting dose ranges for dogs with diabetes. This is not a veterinary prescription.
🐾 Canine Insulin Reference Estimator
Shows the commonly cited starting dose range only. Your veterinarian must prescribe the actual dose for your dog.
Canine Starting Dose Reference
(0.25 U/kg), IU
(0.5 U/kg), IU
(1.0 U/kg), IU
(vet-prescribed)
The AAHA guidelines start lente at 0.25 U/kg every 12 hours and raise the dose no more often than every 1–2 weeks, guided by a glucose curve. The average and upper values show where well-controlled dogs usually end up, not a dose to start at.
Vetsulin and Caninsulin are U-40 (40 IU/mL). Most human insulins are U-100 (100 IU/mL). Using a U-100 syringe with U-40 insulin (or vice versa) will result in a 2.5× overdose or underdose — potentially fatal. Always use the syringe type that matches your insulin concentration exactly, as instructed by your veterinarian.
Understanding Canine Insulin Dosing
Vet Diagnosis First
Canine diabetes requires a veterinary diagnosis — confirmed blood glucose and urine glucose testing. Never start insulin without a confirmed diagnosis.
Vet Prescribes Dose
Your vet determines the starting dose based on your dog's specific blood glucose, weight, health status, and food intake.
Glucose Curves
Dose adjustment uses glucose curves — measurements taken over 12–24 hours. Your vet may do this in clinic or train you to monitor at home.
Consistent Feeding
Dogs with diabetes should eat consistent meals at consistent times, matched to insulin injections. Diet changes can significantly affect dose requirements.
Syringe Type Matters
Vetsulin is U-40 — use U-40 syringes only. Using the wrong syringe type causes severe dosing errors. Ask your vet which syringe to use.
Know Emergency Signs
Weakness, trembling, glazed eyes, or collapse can indicate hypoglycemia. Rub sugar on gums and call your vet immediately.
Canine Diabetes: Key Differences From Human Diabetes
Canine diabetes mellitus most closely resembles Type 1 diabetes in humans — most dogs require lifelong insulin therapy because their pancreatic beta-cell function is severely impaired or absent. Unlike human Type 2 diabetes, oral hypoglycemic agents are generally not effective in dogs, and insulin is required in virtually all cases.
Starting Dose for Dogs (Vetsulin / Lente)
The 2018 AAHA Diabetes Management Guidelines name porcine lente (Vetsulin) as the first choice for dogs and start it at 0.25 U/kg twice daily. The Vetsulin label gives a different starting plan: 0.5 IU/kg once daily with a meal, moving to twice daily if the effect is too short. Most dogs settle on an average of 0.5 U/kg per dose, within a range of 0.2–1.0 U/kg. Vets raise the dose by 10–25% at a time, no more often than every 1–2 weeks.
Why Canine Dosing Requires Individual Veterinary Assessment
- Blood glucose at diagnosis varies widely and affects initial dose
- Concurrent conditions (urinary tract infection — very common in diabetic dogs, Cushing's disease, hypothyroidism) can dramatically alter insulin requirements
- Diet content (carbohydrate amount, feeding schedule) directly interacts with insulin timing and dose
- Intact females have marked insulin resistance driven by progesterone, especially during diestrus — spaying is often recommended to improve glycemic stability
- Individual dogs vary enormously in insulin sensitivity — two same-weight dogs may need very different doses
U-40 vs U-100: Critical Concentration Warning
If your dog is on Vetsulin (U-40) and you use a standard U-100 human insulin syringe, you will inject 2.5× the intended dose — potentially causing fatal hypoglycemia. Always use the syringe size that matches your insulin concentration. Your vet will prescribe the correct syringe.
Dog Insulin Dosage Chart by Weight
The chart applies the AAHA numbers to common body weights. Vets dose from the dog's ideal body weight, so an overweight dog starts from its target weight, not its scale weight. Our guide to insulin dosing in dogs and cats compares lente, PZI and glargine side by side.
| Dog weight | AAHA start (0.25 U/kg, q12h) | Average dose (0.5 U/kg) | Usual upper (1.0 U/kg) |
|---|---|---|---|
| 5 kg / 11 lb | 1 U | 2.5 U | 5 U |
| 10 kg / 22 lb | 3 U | 5 U | 10 U |
| 15 kg / 33 lb | 4 U | 7.5 U | 15 U |
| 20 kg / 44 lb | 5 U | 10 U | 20 U |
| 25 kg / 55 lb | 6 U | 12.5 U | 25 U |
| 30 kg / 66 lb | 8 U | 15 U | 30 U |
| 40 kg / 88 lb | 10 U | 20 U | 40 U |
What is the maximum insulin dose for a dog?
No guideline sets a fixed maximum per dog. Instead, the AAHA guidelines treat a high dose as a warning sign: if a dog needs more than 1 U/kg per injection with no response, or more than 1.5 U/kg without bringing glucose below 300 mg/dL, the vet looks for insulin resistance. Common causes are Cushing's disease, infection, diestrus in intact females, and handling errors such as the wrong syringe or spoiled insulin.
What happens if a dog gets too much insulin?
An overdose causes hypoglycemia, and no safe "lethal dose" figure exists, because a dose that one dog tolerates can drop another dog into seizures. If a dog receives a double dose or a U-100 syringe was used with U-40 insulin, call your veterinarian or an emergency clinic right away, offer food if the dog can swallow, and watch for weakness, wobbling, trembling or seizures. For a dog that is weak or seizing, rub corn syrup on the gums and go to the clinic. Skip the next injection only on your vet's advice.
Is that dose a lot for a dog?
The number of units on its own cannot answer this, because canine doses scale with body weight. The same 20 units is an ordinary dose for one dog and a warning sign in another. The table works 20 units through a range of sizes.
| Dog weight | Dose per kg | How it reads against AAHA guidance |
|---|---|---|
| 5 kg (11 lb) | 4 U/kg | Far above the usual range |
| 10 kg (22 lb) | 2 U/kg | Far above the usual range |
| 15 kg (33 lb) | 1.33 U/kg | Above the usual range |
| 20 kg (44 lb) | 1 U/kg | Within the usual range |
| 30 kg (66 lb) | 0.67 U/kg | Within the usual range |
| 40 kg (88 lb) | 0.5 U/kg | Within the usual range |
| 50 kg (110 lb) | 0.4 U/kg | Within the usual range |
Most dogs settle near 0.5 U/kg per injection, so 20 units suits a dog of roughly 40 kg. The same 20 units given to a 10 kg dog is 2 U/kg, which sits well past the point where the AAHA guidelines stop treating a dose as simply high and start looking for a reason.
Those thresholds appear above: more than 1 U/kg per injection with no response, or more than 1.5 U/kg without glucose falling below 300 mg/dL, prompts a check for insulin resistance rather than a further increase. A rising dose that is not working is information, not a problem to solve with more insulin.
Never raise a dog's insulin dose from a web page. Canine doses are adjusted on glucose curves run by a vet. A dose that looks high in this table may be right for a particular dog, and one that looks normal may still be wrong.
Dog Insulin Calculator: Limitations & Safety Notes
- These are starting-range estimates only. Canine insulin requirement varies widely between individuals and must be titrated by a veterinarian using blood-glucose curves.
- Mismatching U-40 insulin with a U-100 syringe (or the reverse) is a documented cause of serious dosing errors in pets. Always match the syringe to the concentration printed on the vial.
- Vetsulin/Caninsulin (porcine lente), PZI and glargine are not interchangeable unit-for-unit — they differ in onset, peak and duration.
- Never change a pet’s insulin dose without veterinary supervision. Hypoglycemia in dogs can progress to seizures quickly.
This page covers pets only. Human insulin dosing has its own tools in our insulin calculator collection.
Sources & References
- Vetsulin (porcine insulin zinc suspension) dosing overview for dogs. Merck Animal Health. Link — label start of 0.5 IU/kg once daily.
- dvm360. ProZinc now approved for use in dogs. Link
- Feldman EC, Nelson RW, Reusch C, Scott-Moncrieff JC. Canine and Feline Endocrinology. 4th ed. Elsevier; 2015. Chapter 11: Canine Diabetes Mellitus.
- American Animal Hospital Association (AAHA). Diabetes Management Guidelines for Dogs and Cats. 2018. J Am Anim Hosp Assoc. 2018;54(1):1–21. Link — source of the 0.25 U/kg start, the 0.2–1.0 U/kg range and the insulin-resistance thresholds.
Written by Ryan Mitchell · Last updated: October 2026
Frequently Asked Questions: Dog Insulin Calculator
What insulin is used for diabetic dogs?
The AAHA Task Force's first choice for dogs is Vetsulin (porcine lente insulin, U-40), which is FDA-approved for dogs and cats. ProZinc (PZI, U-40) gained FDA approval for dogs in 2019. Some vets use Caninsulin (the same lente product outside the US), NPH (Humulin N, Novolin N, U-100), or detemir or glargine. The choice of insulin, concentration, and syringe type must be determined by your veterinarian — never substitute insulin types without guidance. Using the wrong concentration or syringe can cause a fatal dosing error.
What is the starting insulin dose for a diabetic dog?
The 2018 AAHA guidelines start Vetsulin at 0.25 U/kg every 12 hours, rounded to the nearest whole unit, so a 20 kg dog starts at 5 units twice daily. The Vetsulin label instead starts at 0.5 IU/kg once daily. The actual starting dose must always be set by a veterinarian based on blood glucose at diagnosis, ideal weight, diet and health assessment, then adjusted with glucose curves. Never give your dog insulin without a vet's prescription.
How do I know if my dog's insulin dose needs adjusting?
Glucose curves guide dose adjustment — serial blood glucose measurements over 12–24 hours. Your vet will advise on the monitoring method (in-clinic or at-home). Signs that the dose may need review include persistent hyperglycemia symptoms (excess thirst, frequent urination, weight loss, cloudy lens/cataracts) or hypoglycemia signs (weakness, trembling, disorientation, collapse). Never adjust your dog's dose without veterinary guidance.
What are the signs of hypoglycemia in dogs?
Signs of low blood sugar in dogs include weakness, wobbliness, trembling, disorientation, glazed eyes, seizures, or collapse. If you observe these signs in a diabetic dog: rub Karo syrup or honey on the gums immediately and contact your veterinarian or emergency animal hospital. Do not give another dose of insulin. Severe hypoglycemia in dogs is a veterinary emergency — time matters.
Can cats use the same calculator as dogs?
No. Cats and dogs have very different insulin responses and are treated with different protocols. Cats are more commonly treated with long-acting insulin analogs (glargine or detemir) rather than lente, and the dosing approach differs significantly. Feline diabetes can sometimes go into remission with early, aggressive treatment — a critical difference from canine diabetes. Never use a dog insulin calculator for a cat. Feline diabetes management requires species-specific veterinary guidance.
What is the maximum insulin dose for a dog by weight?
No fixed maximum exists. Most well-controlled dogs use 0.2–1.0 U/kg per injection, averaging 0.5 U/kg, according to the 2018 AAHA guidelines. A dog that needs more than 1 U/kg with no response, or more than 1.5 U/kg without glucose falling below 300 mg/dL, should be checked for insulin resistance rather than given ever-higher doses.
What should I do if my dog got too much insulin?
Call your veterinarian or an emergency animal hospital immediately. Offer a meal if your dog is alert and able to eat, and watch for weakness, trembling, wobbling, glazed eyes or seizures. If your dog is weak or seizing, rub corn syrup or honey on the gums and head to the clinic. Do not give the next insulin dose until a vet tells you to.