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My new puppy has bloody, black, tarry poop. What should I do?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | unneutered | 2 months and 19 days old | 5 lbs

We just bought a puppy and he seems to have bloody tarry poop.

3 Answers

Most Helpful Answer

Ricardo Fernandez, DVM

Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on November 26th, 2017

Thanks for using Petco Pet Education Center, formerly Petcoach! I highly recommend that you have Nico evaluated by a veterinarian as soon as possible for further assessment and treatment. Black tarry stools can be observed with upper gastrointestinal ulceration and bleeding. Things like parvovirus, gastrointestinal ulcers or parasites, among other possibilities can cause that. Good luck!
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Related Answers from Veterinarians

  • Answered By Jenny, DVM

    Veterinarian

    Published on December 23rd, 2017

    Dark, tarry stool is an indication of a small intestinal bleed possibly from the bone or an ulcer. The main thing to continue to monitor for is bloody diarrhea with frank, red blood, vomiting and lethargy. If any of this is noted, you will need to find an ER clinic for further care. You can feed boiled chicken and rice since it is bland and easy to digest until the stool returns to normal.

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    1Pet Parents found this answer helpful

  • Answered By Jessica Keay, DVM

    Veterinarian

    Published on July 4th, 2019

    Dark tarry stools can be a sign of bleeding in the intestinal tract, so I would recommend monitoring your puppy closely and if the stools continue to have this appearance, or if he stops eating, vomits, or becomes weak he should see the veterinarian.

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    2Pet Parents found this answer helpful

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