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Is it normal for 5-week-old puppies to vomit after dewormer?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | unspayed | 2 years and 5 months old | 55 lbs

I gave my 7 five week pups, who I believed to have roundworm, rfd dewormer. And like an hour later a couple of them have puked. Is this normal. Should I be concerned?

2 Answers

Most Helpful Answer

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Answered By Jenny, DVM

Veterinarian

Published on March 4th, 2018

It can be an occurrence in some animals from that medication. As king as they are active and feeling well and have no further episodes I would not worry. It may also cause loose stool or diarrhea I would deworm them again in 1-2 weeks as a follow up

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    Answered By Andrea M. Brodie, DVM

    Veterinarian

    Published on May 25th, 2018

    Yes, this is normal when the puppy has a large worm burden. Now, after being dewormed, there are a lot of dead worms which the body wants to get rid of. It does this by speeding up the bowel movements (diarrhea) and some of the worm toxins cause nausea. This should stop soon. He will probably have to have a second dose of dewormer in about 2 weeks.

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