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My puppy threw up and won't eat after wormer. Is this normal?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Female | unspayed | 3 months and 4 days old | 30 lbs

I got a new puppy who had never been wormed. I don't have the money for another two weeks to take her to the vet. We went to buy her shots and wormer. Her shots went fine and she acted normal so 4 days later I gave her her wormer. Now 2 days later she still hasn't eaten and she just lays around and throws up often. I make she she drinks plenty of water but I am still worried. I've seen online that throwing up can be normal but I want to be sure.

5 Answers

Most Helpful Answer

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Answered By Dr. Leigh, DVM

Veterinarian

Published on July 5th, 2017

I am not sure the type of dewormer or the vaccines that you used but vomiting often, lethargy, and not eating are not typical 2-4 days after vaccination and deworming. It is very concerning that she is having these signs and she could have an infection or possibly have a parasite that was not susceptible to the dewormer that you used. She really should be seen by a vet to determine the cause and treat. She may need an anti-vomiting injection, antibiotic, antacid, gastrointestinal protectant, dewormer, and/or other medications to treat. You could try to find a clinic that would work out a payment plan or apply for care credit and have her seen. Hope she feels better soon!

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    Answered By Dr Stafford, BVetMed, MRCVS

    Veterinarian

    Published on

    Sometimes throwing up is simply due to a mild gastritis in the stomach. You can try starving her for a day then feeding chicken and rice. If she deteriorates or continues to vomit you'll have to go to the vet with her.

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    Answered By Angel Alvarado, LVT

    Licensed Veterinary Technician

    Published on December 24th, 2018

    Do not administer a deworming before the appointed time and certainly not to a potentially sick puppy. Although lethargy and loss of appetite can be side effects, ideally they should be physically examined by your veterinarian to diagnose or rule out other medical causes. Supportive care may also be indicated since puppies can become dehydrated quickly and this may complicate any underlying condition. It is not uncommon milk on to see a purge of worms after a deworming. Offer a bland diet in small, frequent amounts. You can warm it slightly or mix in some plain baby food to stimulate the appetite. A 50/50 solution of water and unflavored PediaLyte can also be offered to treat or prevent minor dehydration.

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    Answered By Ann Dion, DVM

    Veterinarian

    Published on August 12th, 2017

    Hello. If Barbara is still wanting to eat, drink, play and run around then you can wait until the morning, as vomiting after deworming, especially if Barbara had a large number of worms in her, can be normal. If she continues to be normal tomorrow and the vomiting stops, then just continue to monitor and make sure you get her dewormed again at the appropriate time (ask your vet, this will change depending on the medication they used) However, if the vomiting continues, turns bloody/red, or if Barbara becomes weak, tired, not wanting to eat/drink, then it is very important to have her seen right away tonight by a 24 hour center. Best of luck with Barbara!

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    Answered By Stephanie Echols, DVM

    Veterinarian

    Published on August 10th, 2017

    Ruby is adorable! I'm sorry to hear she isn't feeling well. If she still isn't eating I recommend you take her to the vet and have her hospitalized with IV fluids with sugar added. If she doesn't eat, her sugar level is going to get too low because puppies cannot regulate that like adult dogs do. She probably has more parasites and may need a different dewormer to kill them. You can try feeding her boiled chicken and rice or puréed baby food (make sure there is no onion, garlic, or grapes/raisins). Good luck and kisses to Ruby!

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