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Why does my puppy have bloody diarrhea and vomiting after new food?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | spayed | 6 months and 1 day old | 32 lbs

Hi there! I have a 6 month old border collie. On Thursday she had a lot of diarrhea in her crate in the morning and countinued to have it throughout the day. She threw up twice also. After rice meals-- her poop went back to semi-normal-- just slightly soft. Today (after changing her food to a sensitive stomach formula) she had VERY liquid stool with some bright red blood in it. Is this because of the diet change, or should I be worried it is something worse?

2 Answers

Most Helpful Answer

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Answered By Vanessa Yeager DVM MPH

Veterinarian

Published on August 21st, 2017

Good morning and thank you for using Petco Pet Education Center, formerly Petcoach! I am sorry Ruth is having some bowel issues. The sudden change in food may be contributing to the acute colitis she appears to be experiencing. Changing food should be done very slowly in small increments added to old food over the course of a week. There are other possibilities too such as a bacterial or viral infection or a parasitic infection that could be behind her diarrhea. I would have her stool tested for bacteria, viruses, and parasites by your local veterinarian to rule those out. Hope this has helped- best of luck to you and Ruth!

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    Answered By Dr. Massimo Orioles, DVM, Cert AVP, MRCVS

    Veterinarian

    Published on

    These signs could be compatible with an inflammation infection of the gastrointestinal system and surrounding organs (like pancreas and liver). As you tried already with dietary change, a clinical examination at your local veterinarian is now essential to confirm these clinical suspicions and treat appropriately. Antibiotics and possibly further investigations (like abdominal imaging as ultrasound or radiographs) may be needed. Please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further.

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