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Can my dog catch roundworms from another dog after a negative test?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Male | neutered | 8 months and 6 days old | 12 lbs

My friends dog has roundworms and plays with my dog all of the time. I took in stool sample from my dog (may have been older than 24 hours). Vet said no worms. Is it possible he could still get them?

1 Answer

Most Helpful Answer

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Answered By Laura Johnson VMD

Veterinarian

Published on February 19th, 2018

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! In order for Jim to get round worms from your friends dog he would have to eat his stool. Transmission is fecal oral. So as long as Jim doesn't eat poop he should be fine. Also if he is on monthly heartworm prevention that also is a monthly dewormer. I hope this helps!

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