All hazards › Medications › Insulin (Lantus, Humalog) & dogs

Is Insulin (Lantus, Humalog) Safe for Dogs?

☠️ Toxic
✅ Cross-checked against veterinary poison-control guidance · Oct 2026 audit
⚠️ Educational info only. If your pet just ate or touched something and looks unwell, skip the reading and call your vet — or Pet Poison Helpline (US): (855) 764-7661, ASPCA Poison Control (US): (888) 426-4435.
No. An insulin overdose can cause fatal hypoglycemia in dogs — a chewed pen, spilled vial, or extra dose is an emergency, not a wait-and-see problem.

Why it’s a problem

Insulin drives blood sugar down, and a dog that chews an insulin pen or vial can absorb a full dose through the lining of the mouth, not just from what it swallows. Dog stomachs can pierce the plastic pens easily. Hypoglycemia can develop within hours and progress to seizures, coma, and death if untreated, and even a diabetic dog on prescribed insulin can be poisoned by an accidental double dose.

How to keep your pet safe

Store pens, vials, and syringes in a closed refrigerator or a high cabinet, since dogs chew through pen caps and plastic bodies. Never adjust a prescribed dose on your own, and never use another person’s or pet’s insulin. Ask your vet in advance how to handle a missed or doubled dose.

Warning signs to watch for

Weakness, wobbliness, stumbling, trembling, extreme hunger or listlessness, drooling, glassy stare, seizures, collapse, unconsciousness.

When to call the vet

Call a veterinarian or pet poison hotline immediately if your dog chews a pen, drinks spilled insulin, or gets an unintended dose — do not wait for symptoms. Early treatment with food or IV dextrose can save its life. Only apply syrup to the gums if a professional advises it.

Common questions

My dog bit my insulin pen — what now?

Treat it as an emergency. Dogs can absorb insulin through the mouth even if little is swallowed, and hypoglycemia can come on fast. Call your vet or a pet poison hotline right away.

Can I give my diabetic dog an extra dose if his sugar seems high?

Never change an insulin dose without veterinary direction. Extra insulin can crash blood sugar and cause seizures. Ask your vet how to interpret glucose readings and when to adjust.

More medications hazards for dogs

🐶 Ibuprofen (Advil, Motrin)☠️ ToxicNo. Ibuprofen is toxic to dogs even in small amounts — never give it, and treat any swallowed pi🐶 Acetaminophen (Tylenol, Paracetamol)☠️ ToxicNo. Acetaminophen damages a dog’s liver and red blood cells — never give it without veterinary d🐶 Naproxen (Aleve)☠️ ToxicNo. Naproxen is highly toxic to dogs even in small amounts — treat any swallowed tablet as an em🐶 Aspirin🚫 Not SafeNot on your own. Aspirin can cause stomach ulcers and bleeding in dogs and should only ever be u🐶 Diclofenac gel (Voltaren)☠️ ToxicNo. Diclofenac gel is a strong NSAID, and licking it off skin or chewing a tube can seriously po🐶 Celecoxib (Celebrex)☠️ ToxicNo. Celecoxib is a human NSAID, and a swallowed capsule can cause stomach ulcers and kidney dama

This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate or touched something concerning, contact your veterinarian or a pet poison hotline right away. In the US: Pet Poison Helpline (855) 764-7661, ASPCA Animal Poison Control (888) 426-4435 (fees may apply).