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My dog's stools are often black after vomiting blood. Should I worry?

Updated on September 23rd, 2025

Pet's info: Dog | Yorkshire Terrier | Female | spayed | 3.5 lbs

My 3.5 lb. York ie had a vomiting spell for 24 hours. The last 6 hours was blood. Vet said gastroenteritis. Occasionally before she would have black stools, since, her stools are black frequently? How concerned should I be? Also will the quiac stool test, for blood in stool, used on humans work for animals? Thank you

2 Answers

Most Helpful Answer

Answered By Jenna Beyer, DVM, MBA, cVMA

Veterinarian, Certified Veterinary Acupuncturist

Published on August 11th, 2019

Black, tar-like stools are common with bleeding in the stomach, upper GI tract. Bleeding that occurs lower in the GI tract with have red blood in the stools. I have never needed a human test to check for blood in the GI tract. Gastroenteritis is a common cause for blood in vomit and/or stools. Some cases are mild and respond to medications and out-patient treatment, while others, such as HGE, require hospitalization, IV fluids, and IV medications. Some dogs will have very dark stools that are normal and do not contain blood.

1Pet Parents found this answer helpful

Related Answers from Veterinarians

Answered By Bobbi Musgrove, DVM
Veterinarian
Published on April 20th, 2017
I understand your concern. Seeing fresh blood can be common when the colon is inflamed, but black or tar-like stools can indicate bleeding in the small intestines or stomach. This is more serious for sure. It can be an emergency if there is on-going bleeding. The best choice would be to have Spock evaluated ASAP to ensure there is no crisis about to occur. Also, starting the appropriate medications tonight would be really helpful to prevent further issues.
It is never wrong to get a second opinion, particularly when you are worried. You know your pet best. If there are not general practices available at this time, then take Spock to the nearest emergency veterinary clinic.
Good lck!
1Pet Parents found this answer helpful

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