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My dog is vomiting brown and has bloody, fishy diarrhea. What to do?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | unspayed | 1 year and 1 month old | 23 lbs

my dog(female) has been vomiting a brown thick substance and right after that had watery red brown diarrhea. Diarrhea had a rotten fish smell. This began last night. She has thrown up at least 3 times today and its currently 11:40am. And diarhrea nonstop :(

1 Answer

Most Helpful Answer

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Answered By Oneal Bogan, DVM

Veterinarian

Published on November 2nd, 2017

Hi there. I would recommend taking your dog to the emergency vet clinic as soon as possible. It sounds like she’s extremely sick and needs x-rays and bloodwork and also probably to be started on intravenous fluids because she will become dehydrated quickly. Dogs that are vomiting and also have diarrhea usually need medications to stop their symptoms so they can start holding down food again. Your dog could have been infected by a virus or bacteria but she does need to be seen as soon as possible. Best to you and Luna.

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