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Why is my 4-month-old puppy throwing up and has watery diarrhea?

Updated On September 23rd, 2025

Pet's info: Dog | Pit Bull Terrier | Female | unspayed | 4 months and 1 day old | 16 lbs

My 4 month old female is throwing up constantly in the mornings at first it’s her food then starts to look clear and mucusy and explosive diarrhea like water all of a sudden no diet change second round of boosters was 4 days ago

1 Answer

Most Helpful Answer

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Answered By C. Rathjens, DVM

Veterinarian

Published on April 4th, 2019

With a dog so young, I would recommend taking her in for an exam because she can get dehydrated quickly with both vomiting and diarrhea. The cause could be a reaction to the vaccine (although less likely because it's her second round, and reactions would usually only take an hour or two), an infection, intestinal parasites, or it's very possible a cause won't be found. Some supportive care (some combo of fluids, anti vomiting and anti-diarrhea medication, bland food, and probiotics) can help her recover if no cause is found.

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