There's a lump where my puppy got his shot. Is that normal?

By Dr. Steve Pelton, DVM

The short answer

A small, firm, painless bump where a vaccine went in is common. It's the body reacting to the shot, and it usually shrinks on its own, though it can hang around for a few weeks. Call if it's growing, sore, or still there after about a month.

Why it happens

Immune cells gather at the spot to work with the vaccine, and that little crowd makes a firm bump that fades over a few weeks.

Which door?

WATCHA small, firm, painless bump can hang around a few weeks.
CALL TODAYIt's growing, sore, or still there after about a month.

When to call

Tick what fits and see which door you're at.

CALL TODAYGrowing, sore, or still there after about a month
GO NOWFace swelling, hives or trouble breathing after a shot

Your door: WATCHWATCH

Nothing ticked and he's bright, playful, eating and drinking? Keep an eye on him, jot down what you see, and call in the daytime if it doesn't settle.

Under 16 weeks, a toy breed, or not done with his shots? Move everything one door closer to GO NOW.

GO NOW means: Head to your vet, if they're open and can see him right away, or to the nearest emergency clinic. Call on the way so they're ready for you.

Not sure which door you're at? That's a call. Call your vet.

Worried right now? Check the Three Doors list, from most urgent down, and stop at the first door that fits.

Is this an emergency?

General education, not veterinary advice. Your vet's plan for your puppy comes first.