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My dog threw up a moving worm after deworming. Should I see the vet?

Updated on September 23rd, 2025

Pet's info: Dog | Border Collie | Male | 1 month and 26 days old | 10 lbs

My dog just threw up what seems to be a round worm. He supposedly had a deworming on December 3rd. The worm that he threw up was moving and I don’t know if I should take him to the vet or wait. No worms in his stool.

3 Answers

Most Helpful Answer

Answered By Maria DVM

Veterinarian

Published on December 9th, 2017

I would recommend letting your veterinarian know that Bernie vomited a roundworm.

It is very common for puppies to have roundworms and the dewormer is most likely killing them off. I would recommend depending on what type of dewormer to deworm again in 2 weeks or change the dewormer. Sometimes it takes a second round of deworming puppies.

Thank you for using Petco Pet Education Center, formerly Petcoach.

2Pet Parents found this answer helpful

Related Answers from Veterinarians

Answered By Ana M, DVM
Veterinarian
Published on March 18th, 2020
Thank you for submitting your question regarding Courage. Round worms are common in dogs and can look like spaghetti. I recommend that he sees his veterinarian. He will need to be examined. I worry that he will be dehydrated from vomiting so much. If so, he would benefit from subcutaneous fluids and anti-nausea medication. Fecal testing will need to be performed. It is common for dogs to be infected with more than one type of parasite. It is important to know so that he can be treated properly. Many parasites can be spread to humans as well. I hope this information helps!
1Pet Parents found this answer helpful
Answered By Dr Stafford, BVetMed, MRCVS
Veterinarian
Published on March 22nd, 2018
They look like round worms which are fairly common, regular worming should help this. As long as the burden is not huge they should not go too much damage, however in extreme cases symptomatic and supportive treatment can be required.
1Pet Parents found this answer helpful

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