I see worms in my puppy's poop. What now?

By Dr. Steve Pelton, DVM

The short answer

Call your vet today and snap a photo. Some worms look like spaghetti, others like grains of rice, and your vet will want to know which. The exception is the day or two right after a dewormer, when seeing worms is gross but normal. It means the medicine is working.

Why it happens

Many puppies pick up roundworms from their mother before they're even born, which is why deworming starts early and repeats. Most worms are invisible, so the schedule matters more than what you spot.

Which door?

CALL TODAYCall today, and take a photo.
WATCHFor a day or two right after a dewormer.

Usually normal

Worms in the poop for a day or two after deworming, maybe a soft stool

When to call

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

CALL TODAYWorms you see before any deworming, or a puppy who's tired and pale
CALL TODAYHe vomits soon after a dose of dewormer
GO NOWTired and flat with vomiting or diarrhea

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.