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My 10-week-old puppy is vomiting after drinking water. What's wrong?

Updated On September 23rd, 2025

Pet's info: Dog | German Shepherd | Female | 2 months and 11 days old | 12 lbs

Good evening, my nephew just picked up his german shepherd puppy that is 10 wks old. The puppy drinks a little water and shortly after will begin vomiting. It also vomited twice before we was able to get it to drink. I am worried that something is wrong. The breeders had made my nephew wait a few days longer than originally stated because the pyppy had an allergic reaction to the dewormer vaccinations I have never heard of that and i am concerned something is wrong with this precious puppy. HELP

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on March 24th, 2018

Congrats on your nephew's new puppy, but I'm sorry that Mia is sick! While puppies can have reactions to deworming treatments such as vomiting, dewormers are typically very safe. An allergic reaction to a deworming medication would be very rare. In addition, it should not still be sick from the deworming treatment days afterwards. To me, that suggests there could be something more wrong with her. Given her age, she won't be fully vaccinated, and one of the diseases I would be most concerned about is parvovirus. This is a very deadly disease of unvaccinated dogs, and it's extremely contagious. This causes vomiting, and dehydration from this vomiting will occur especially if she can't keep down water. Dehydration is the number one cause of death in these puppies. Because I can't see her in person to rule out parvovirus or another cause of the vomiting such as a GI illness, eating something rotten, or a foreign body, I do think having her seen by a vet now is for the best. Please take her into an ER vet clinic; if there isn't one in your area, there will be a vet on call for emergencies. The information to reach that vet is found on a clinic's answering machine or website. Best of luck, I hope this helps!

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