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Question

Should I pull back the plunger, and how fast do I inject?

Sunny, owner notes“I wish my dog lived as long as I do.”Updated

I'm an owner, not a vet. This is not veterinary advice, so check anything medical with your own vet.

Short answer

Ask your vet or nurse to show you with your own supplies, then watch you do it. The plunger, injection speed and where the needle goes are all things you learn by being shown, so ask them to explain each step. If you're not sure an injection went in properly, call your vet. Don't give another to make sure.

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Match the U number on the vial and the syringeIllustration. Top left: a vial labelled U-40, 40 units per ml, next to a red-capped syringe printed U-40, with a green tick: match. Top right: a vial labelled U-100, 100 units per ml, next to an orange-capped syringe printed U-100, with a green tick: match. Bottom: a U-40 vial next to an orange-capped U-100 syringe, with a red cross: wrong amount, don't inject, call your vet. Cap colours vary by maker, so always read the U number printed on the vial and the syringe.U-4040 unitsper mlRed capU-40MatchU-100100 unitsper mlOrange capU-100MatchNot a matchU-4040 unitsper mlOrange capU-100Wrong amount —don't inject,call your vetCap colours vary by maker.Always read the U number printedon the vial and the syringe.
Before every injection, look at two things: the U number on the vial and the U number on the syringe. Same number, go ahead. Different number, stop and ring your vet. Don't go by the cap colour alone.

I never give insulin amounts here. Yours comes from your vet's written plan.

What to know at home

It's completely normal to need another lesson after the first one. A syringe that looks the same can still come with different instructions. Tell the vet if your dog wriggles, snaps or seems to be in pain, so they can show you a safer way.

Check the vial and the syringe show the same U number, every time. If injections seem to hurt, ask your vet about a thinner needle: the higher the G number, the thinner it is. Our page on choosing syringes and needles explains gauge and length.

What to write down

  • Device and insulin packaging
  • The exact step that feels unclear
  • Wet fur, movement or other concerns during the attempt

What to ask next

Ask them to show you first and then watch you do it. Agree with them now what to do next time you're not sure an injection went in.

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Sources

Every outside source I used is listed on the Sources page.

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