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Puppy pooping worms after deworming. Is it working or concerning?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | unspayed | 11 lbs

My puppy recently went to the vet and took some heart worm and flea medicine today. Later on in the day I noticed long worms in her poop. Should I be really concerned or is this just the medicine working and deworming her?

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1 Answer

Most Helpful Answer

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Answered By Dr. Heidi DVM, CVA, CCRT, CVTP, CVSMT, CVCH

Veterinarian, Certified Veterinary Acupuncturist, Certified Canine Rehabilitation Practitioner

Published on January 3rd, 2018

Congratulations on your new puppy. I have a dog named Hayden too! I suspect what you are seeing are roundworms. They are commonly passed in the stool after deworming, so you are correct that it just means that the medication is working. I have attached a handout below with more information on roundworms. https://www.veterinarypartner.com/Content.plx?P=A&S=0&C=0&A=476 Since we now know she had a roundworm infection, be sure to clean up after her each time she goes, so the yard does not get infected. I hope that was helpful. Thanks for using PetCoach.

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