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Dog Vomiting Blood: Causes and When It's an Emergency

By the Dog Health Handbook team · Updated · Fact-checked against current veterinary references (see sources)

Key takeaways

  • Any blood in vomit needs a call to your vet.
  • Bright red blood is fresh. Coffee grounds is digested blood, often from an ulcer.
  • Pale gums, weakness, repeated vomiting or a swollen belly mean go to an emergency vet.
  • Pain relievers and rat poison are important causes. Never give human pain relievers.
  • Most dogs recover when the cause is found and treated quickly.

Table of Contents

Research Red or coffee grounds? Causes Is it an emergency? What to do At the vet Prevention FAQ Sources

Digestive System QuickLinks

Constipation Colitis IBD Dog Vomiting Throwing Up Yellow Giardia Canine Diarrhea Poop Chart Mucus in Poop White Foam Vomit Vomiting Blood Upset Stomach

Blood in a dog's vomit, called hematemesis, always needs a vet's attention. A small streak after hard retching can come from simple irritation, but blood can also be a sign of a stomach ulcer, poisoning, a swallowed object, parvovirus or a bleeding disorder.1,2,3 This guide explains what bright red blood and coffee-ground vomit mean, the common causes, when it's an emergency, what to do on the way to the vet, and what vets check.

Go to an emergency vet now if your dog is vomiting blood and:

  • There is more than a small streak, or the vomit looks like coffee grounds3,4
  • The vomiting keeps happening3,1
  • The gums are pale, or your dog is weak or has collapsed3,2
  • The belly is swollen, or your dog is retching without bringing anything up3,5
  • There is bloody diarrhea or black, tarry stool1,2
  • Your dog may have eaten rat poison, human pain relievers or another toxin6,7

What the Research and Guidelines Say

  • Anti-inflammatory drugs are a leading cause of ulcers. Anti-inflammatory pain relievers (NSAIDs), cancer and liver disease are the most commonly reported causes of stomach ulcers in dogs. Giving an NSAID together with a steroid raises the risk and should be avoided.8
  • Doubling up on pain relievers is dangerous. In a series of 29 dogs whose stomach or intestine perforated while taking an anti-inflammatory pain reliever, almost all had been given more than the approved dose or another anti-inflammatory or steroid shortly before, and 20 died or were put to sleep.9
  • Rat poison bleeding is delayed. After a dog eats an anticoagulant rat poison, bleeding usually starts 3 to 7 days later, so a dog can look normal at first.6
  • Most dogs recover when the cause is found quickly.1 But ulcers that break through the stomach wall are serious: more than half of dogs with a perforation die.4,8

Bright Red Blood or Coffee Grounds?

The look of the blood is one of the most useful clues for your vet.3

  • Bright red blood or streaks is fresh blood. It often comes from the mouth, throat or esophagus, or was swallowed from a nosebleed or a cut in the mouth, but a bleeding ulcer can also cause fresh blood.1,2,3,4
  • Dark brown, clotted or coffee-ground vomit is blood that has been partly digested. It usually comes from the stomach or the first part of the small intestine and is a classic sign of a stomach ulcer.1,3,4
  • Pink, red-tinged foam or vomit means a small amount of blood mixed with fluid. It is less serious than a large amount of blood but still needs a vet check.1

Brown vomit can be digested blood, but it can also be food or feces. If you aren't sure, treat it as blood and call your vet.10

Why Is My Dog Throwing Up Blood?

  • Irritation from repeated vomiting. Hard, repeated retching from any cause can irritate the stomach or esophagus and produce a streak of blood.1,3
  • Stomach ulcers, most often linked to anti-inflammatory pain relievers, liver disease or cancer. Kidney disease, Addison's disease and certain tumors that raise stomach acid can also cause them.8 Ulcers don't always cause signs until they bleed.4
  • Human pain relievers. Even small amounts of some human pain relievers can cause stomach ulcers, bloody vomit and black stools in dogs.7 Never give a human pain reliever unless your vet prescribes it.
  • Rat poison. Anticoagulant rat poisons stop blood from clotting. Signs can include weakness, nosebleeds, trouble breathing and vomiting blood.6
  • Swallowed objects, including sharp bones and sticks, which can scrape or block the gut.1,2
  • Parvovirus in puppies, often with bloody diarrhea. See parvo in dogs.1,11
  • Acute hemorrhagic diarrhea syndrome (AHDS), formerly called hemorrhagic gastroenteritis. It causes sudden vomiting and jam-like bloody diarrhea, mostly in small and toy breeds.12,13 See bloody diarrhea in dogs.
  • Bloat, which can include bloody vomit along with retching and a swollen belly.3 See bloat in dogs.
  • Bleeding disorders, inflammatory bowel disease, parasites, injuries and cancer.2,1
  • Swallowed blood from the mouth, nose or a licked wound.2,3

Is My Dog Vomiting Blood an Emergency?

Sources differ on a single small fleck, so call your vet whenever you see blood. A single small streak after hard retching, in a dog who is otherwise bright, is often from irritation, but call your vet the same day.3,1 Go straight to an emergency vet for any of the signs in the box at the top of this page. A problem that looks minor can turn serious within hours.1

Can a dog survive vomiting blood? Yes. Most dogs recover fully when the cause is found and treated quickly.1 The outlook is worse when an ulcer has broken through the stomach wall, when there is heavy blood loss, or when the bleeding comes with another serious illness.8,14

What to Do if Your Dog Throws Up Blood

  • Call your vet or an emergency clinic right away and describe what you see.1,3
  • Take a photo of the vomit, or bring a sample in a sealed bag. Note when it happened and how much there was.1,3
  • Check your dog's gums. Pale, white or bluish gums are an emergency.3,2
  • Don't give food, and ask your vet about water, while you arrange care.1,3
  • Don't make your dog vomit, and don't give human medicines unless your vet tells you to.3
  • If your dog may have eaten a poison or medicine, bring the packaging and call your vet or a pet poison hotline.3

What Your Vet Will Check

Your vet will first make sure your dog is stable, then ask about diet, medicines and any chance of poisoning or swallowing something. Tests may include blood work, clotting tests, a stool test, X-rays or ultrasound, and tests for infections such as parvo.1 Endoscopy, a camera passed into the stomach, is the most accurate way to find ulcers.8 Clotting tests are especially important if rat poison is possible.6

Treatment depends on the cause and may include IV fluids, anti-nausea medicine, medicines that reduce stomach acid, stomach protectants, and surgery for a perforated ulcer or swallowed object.1,8 Rat poison has a specific antidote your vet can give.6 Dogs with ulcers often need treatment for 6 to 8 weeks.4

How to Lower the Risk

  • Give pain relievers only as prescribed, and never combine two anti-inflammatories, or an anti-inflammatory and a steroid, unless your vet tells you to.8,9
  • Keep human medicines and rat poison out of reach. Over-the-counter medicines and supplements are the most common cause of pet poisoning calls to the ASPCA.15,6
  • Don't give bones or sticks to chew.1,2
  • Keep puppies up to date on parvo vaccinations.16

Frequently Asked Questions

Is blood in dog vomit an emergency?

Call your vet whenever you see blood. Go straight to an emergency vet if there's more than a streak, coffee-ground material, repeated vomiting, pale gums or weakness.

What does it mean when a dog throws up red foam?

It usually means a small amount of blood mixed with foam, often from irritation after retching. It still needs a vet check.

Why is my dog throwing up blood but acting normal?

A small streak can come from irritation, but ulcers and rat poison can look mild at first. Call your vet the same day.

What does coffee-ground vomit mean in dogs?

It is partly digested blood from the stomach or upper intestine, often from an ulcer. Go to your vet or an emergency vet now.

Can a dog survive vomiting blood?

Yes. Most dogs recover when the cause is found and treated quickly.

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Sources and further reading

This article was rewritten and fact-checked on October 18, 2026 against current veterinary references and specialist guidelines:

  1. Mitchell SC. Why Is My Dog Throwing Up Blood? PetMD, March 31, 2023.
  2. Burkhill G. Symptom: blood in vomit. Animal Trust Vets CIC, July 2026.
  3. Webvet Editorial Team (reviewed by Elliott P). Dog Vomiting Blood. Webvet, June 29, 2026.
  4. Defarges A, Blois S, Hall EJ, Gibson TWG, Mitchell KD. Disorders of the Stomach and Intestines in Dogs. Merck Veterinary Manual (pet owner version), full review May 2018, last updated June 2026.
  5. American College of Veterinary Surgeons. Gastric Dilatation-Volvulus. ACVS animal owner resource, last modified October 30, 2023.
  6. Tauer D (reviewed by Brutlag A). Anticoagulant Rodenticide Poisoning in Animals. Merck Veterinary Manual (professional version), reviewed November 2025.
  7. Schmid R, Brutlag A, Gollakner R. Ibuprofen Poisoning in Dogs. VCA Animal Hospitals, updated August 14, 2026.
  8. Blois S (reviewed by Carnevale J). Gastrointestinal Ulcers in Small Animals. Merck Veterinary Manual (professional version), reviewed January 2025, updated August 2025.
  9. Lascelles BDX, Blikslager AT, Fox SM, Reece D. Gastrointestinal tract perforation in dogs treated with a selective cyclooxygenase-2 inhibitor: 29 cases (2002-2003). Journal of the American Veterinary Medical Association 227(7):1112-1117, 2005. PMID 16220672.
  10. Gillette L. Dog Vomiting: Causes, Treatment, and When To Worry. PetMD, April 7, 2026.
  11. Cornell Richard P. Riney Canine Health Center. Parvovirus: Transmission to treatment. Cornell University College of Veterinary Medicine, updated April 2024.
  12. Collier A (reviewed by Carnevale J). Acute Hemorrhagic Diarrhea Syndrome in Dogs. Merck Veterinary Manual (professional version), reviewed June 2025.
  13. Weir M, Hunter T, Ward E. Acute Hemorrhagic Diarrhea Syndrome in Dogs. VCA Animal Hospitals, updated June 5, 2026.
  14. Swann JW, Maunder CL, Roberts E, McLauchlan G, Adamantos S. Prevalence and risk factors for development of hemorrhagic gastro-intestinal disease in veterinary intensive care units in the United Kingdom. Journal of Veterinary Emergency and Critical Care 26(3):419-427, 2016. doi:10.1111/vec.12434.
  15. ASPCA. The Top 10 Toxins of 2025. ASPCA Animal Poison Control Center, March 15, 2026.
  16. Gallagher A (reviewed by Carnevale J). Canine Parvovirus. Merck Veterinary Manual (professional version), reviewed June 2025.

About this article

Last updated : page rewritten using Merck Veterinary Manual, PetMD, VCA, Animal Trust and Webvet guidance and published research on stomach ulcers and bleeding in dogs.

This page is for general information and is not a substitute for an exam by your veterinarian.