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My puppy vomited a roundworm. How long until the dewormer works?

Updated On September 23rd, 2025

Pet's info: Dog | German Shepherd | Male | unneutered | 2 months and 16 days old | 20 lbs

My 10 week old German Shepard named atlas vomited a roundworm today and I immediately went to the store to get the medication. But he still hasn't pooped any out and it's been over an hour since I gave it to him. And like 10 mins ago he went to the bathroom and there were no worms. What should I do he's has a vet appointment this Saturday at 6:30 pm

1 Answer

Most Helpful Answer

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Answered By Dr. Massimo Orioles, DVM, Cert AVP, MRCVS

Veterinarian

Published on July 5th, 2017

He will get rid of the worms and you will see them in the feces later. The medications take 4 hours at least to reach right concentration in the blood stream and spread all around effectively. Please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further.

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