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My puppy ate worms he passed after deworming. Will he get reinfected?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | unneutered | 1 month and 27 days old | 11 lbs

What happens if my 10 weeks old puppy eats the roundworm he passes in his stool? He is on medicine for them and is currently pooping a lot but at night until he is better he is in his crate and this medicine makes him poop a lot and if he does and I dont get it immediately he eats it back up!

1 Answer

Most Helpful Answer

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Answered By Catherine Stecyk

Veterinarian

Published on September 5th, 2018

Hello and thank you for reaching out to Petco Pet Education Center, formerly Petcoach. I'm sorry to hear that Charlie has roundworms and that he seems to enjoy eating his feces! As gross as it may be, it is OK if he does this, since he is receiving a deworming medication. These medications work to kill the worms in his gastrointestinal tract, so the adult worms are dead when they are passed into his feces. Depending on the type of dewormer, it may target parasite eggs as well, in which case he should be fully covered. I recommend asking your veterinarian if the deworming medication he is taking covers all life-stages of the parasites. If it does, it should kill everything from eggs to adults, meaning anything that Charlie eats is already dead and cannot re-infect his gastrointestinal tract. Obviously, ideally he would not have the opportunity to eat his feces, but I understand this is difficult to prevent. Best of luck with your new puppy, and I hope this is helpful!

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