Why Do Dogs Throw Up Blood: Causes and Treatment

Dogs are prone to getting into things they shouldn’t, and unfortunately, those things can sometimes cause vomiting. When a dog vomits, it’s typically just food and bile, but when a dog vomits blood, it’s cause for concern. If your dog is throwing up blood, it’s important to get to the bottom of what’s causing it. This article will cover the common causes of vomiting blood in dogs and what you can do about it.

Common Causes of Vomiting Blood in Dogs

Gastrointestinal Ulcers

Gastrointestinal ulcers are one of the most common causes of vomiting blood in dogs. These ulcers can occur in the stomach or the intestines, and they can be caused by a variety of things, including stress, medication, and infection. These ulcers can be very painful and can lead to vomiting, diarrhea, and a loss of appetite. If you suspect your dog has gastrointestinal ulcers, it’s important to seek veterinary care right away.

Gastrointestinal Bleeding

Gastrointestinal bleeding can happen for a variety of reasons, including ingesting a foreign object, pancreatitis, or liver disease. This bleeding can cause your dog to vomit blood, and it can also lead to diarrhea or bloody stools. If your dog is vomiting blood and has diarrhea or bloody stools, it’s important to take them to see a veterinarian immediately.


Cancer can cause vomiting blood in dogs, particularly gastrointestinal cancers such as stomach cancer or intestinal cancer. These cancers can cause inflammation and bleeding in the digestive tract, which can lead to vomiting blood. Other symptoms of cancer can include weight loss, lethargy, and a loss of appetite.


Coagulopathy is a disorder that affects a dog’s ability to clot their blood properly. This disorder can be caused by a variety of things, including liver disease, kidney disease, or exposure to toxins. Dogs with coagulopathy may vomit blood or show signs of nosebleeds or bruising.

Treatment for Vomiting Blood in Dogs

The treatment your dog receives will depend on the underlying cause of their vomiting blood. If your dog has gastrointestinal ulcers or bleeding, they may need medication to reduce inflammation and help stop the bleeding. If your dog has cancer, they may need surgery, chemotherapy, or radiation therapy. Dogs with coagulopathy may need blood transfusions or medication to help improve their ability to clot their blood.

Prevention of Vomiting Blood in Dogs

Preventing vomiting blood in dogs is often about being vigilant and monitoring your dog’s behavior. Make sure your dog is not eating things they shouldn’t, such as poisonous plants or garbage. If your dog is prone to eating things they shouldn’t, it may be helpful to use a basket muzzle when outside. Additionally, ensure that your dog is up to date on their vaccinations and has regular checkups with a veterinarian to detect and treat any illnesses or conditions early on.


Vomiting blood in dogs can be a symptom of a serious condition, and it’s important to take it seriously. If your dog is vomiting blood or showing other signs of illness, do not hesitate to seek veterinary care. With early detection and proper treatment, many conditions can be managed, and your dog can lead a happy and healthy life.


  • What can cause vomiting blood in dogs?
    Vomiting blood in dogs can be caused by gastrointestinal ulcers, gastrointestinal bleeding, cancers, or coagulopathy.
  • What should I do if my dog is vomiting blood?
    If your dog is vomiting blood, it’s important to seek veterinary care right away.
  • How is vomiting blood in dogs treated?
    The treatment for vomiting blood in dogs will depend on the underlying cause. Your dog may need medication, surgery, chemotherapy, or blood transfusions.
  • Can vomiting blood in dogs be prevented?
    Vomiting blood in dogs can often be prevented by being vigilant about what your dog eats and ensuring they have regular checkups with a veterinarian.


  • Levy, J. K., & Crawford, P. C. (2004). Gastrointestinal tract. In B. C. Shellito (Ed.), The Cornell book of cats and dogs. Cornell University Press.
  • Taboada, J., & Johnson, L. R. (2012). Gastrointestinal tract. In J. Taboada & L. R. Johnson (Eds.), Veterinary medicine: A textbook of the diseases of cattle, horses, sheep, pigs, and goats (pp. 387-504). Elsevier.
  • Woods, K. S. (2018). Small animal medical differential diagnosis. John Wiley & Sons.

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