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Is my puppy sick after deworming? Medicine or serious illness?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | unspayed | 2 months and 12 days old | 9 lbs

I dewormed my litter of puppies after one of them passed just very near recently she had worms. Well one of them is starting to show the same problems as the one who passed. After deworming she's vomiting diarrhea weight loss and loss of appetite. Could it be the medicine? The other puppies are doing great. The worming medicine I used is pro sense dewormer solution roundworms. Both showed/shows same symptoms.

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1 Answer

Most Helpful Answer

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Answered By Laura Johnson VMD

Veterinarian

Published on July 2nd, 2018

Hi,t hanks for using Petco Pet Education Center, formerly Petcoach! Dewowmers have the potential to cause an upset stomach such as vomit, diarrhea and decreased appetite. Though I am worried something else is going on since you lost a puppy recently. I worry most about parvo virus in puppies this age, especially if they are yet to be vaccinated. I would have this puppy seen today by your Vet and tested for parvo virus as it is VERY contagious and if it is the cause it will likely affect the entire litter. If it isn't parvo the Vet can at least get this puppy feeling better and prevent dehydration. Good luck!

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