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What To Do About Bloody Diarrhea & Vomit in Dogs

Our Orange County vets understand that it can be alarming to see blood in your dog's stool or vomit. There are a number of reasons why bloody stool or vomit in dogs can occur. Today we share some of the causes and when to head to your vet's office.

How can I tell if it's actually blood?

If your pup's vomit or stool is streaked with fresh blood, this could be a sign that it’s from either the upper part of their small intestine or from your dog's stomach. If the blood is partially digested it will look a bit like coffee grounds and may have originated from lower in your dog's intestines. Other symptoms you may notice include lack of appetite, abnormal stool such as diarrhea, or fatigue.

If the blood is fresh it may be from your pet's colon, but if it’s dark, tarry or sticky, it's likely from your pup's stomach or upper intestinal tract.

What could be causing blood in my dog’s stool or vomit?

If you’ve spotted blood in your dog’s stool or vomit, you’re bound to be concerned - what could be the cause? Should you head to an emergency vet?

Some of the most common causes for bloody vomit or diarrhea in dogs include:

  • Hemorrhagic gastroenteritis (HGE) (severe bloody diarrhea and bloody vomiting, caused by infectious agents)
  • Stomach ulcers
  • Viral or bacterial infection
  • Trauma to the gastrointestinal (GI) tract from eating bones or other materials.
  • Foreign body ingestion (toys, rocks, fabric etc)
  • Severe vomiting
  • Parasites
  • Sudden dietary changes that cause irritation or impact the immune system
  • Stomach or esophagus tumors
  • Poisoning from toxins such as plants

Other symptoms that may become apparent if your dog is experiencing continuous vomiting or diarrhea include weight loss, fluid loss, dehydration, lethargy, electrolyte imbalances, hypovolemic shock and hemoconcentration.

There's blood in my dog's stool or vomit, what should I do?

Regardless of the cause, bloody diarrhea or vomiting is an emergency that could potentially be fatal if left untreated, so immediate veterinary care is called for.

At Veterinary Medical And Surgical Group–OC (VMSG-OC), our board-certified internal medicine vets are here to offer advanced care for pets with internal health conditions.

Our Orange County team of emergency vets treats animals in circumstances requiring urgent medical care, including life-threatening emergencies.

What will the vet do if I bring my dog in?

The underlying cause of your dog's bloody vomit or diarrhea can be challenging to diagnose. If routine diagnostic procedures are unsuccessful in pinpointing the cause more invasive diagnostic testing may be needed to diagnose the issue.

When you take your dog to your veterinarian or the emergency vet due to bloody diarrhea or vomiting this is what you can expect:

Taking Medical History

The vet treating your pooch will ask you for a full medical history for your dog. The more information you can give the vet, the better. Valuable information in your dog’s medical history may include:

  • Whether they’ve had intestinal blockages, physical obstructions, ulcers or tumors in the past
  • Your dog's vaccination record (to rule out parvovirus)
  • How severe your pup's diarrhea or vomiting has been. Has it progressed since it began?

Physical examination

  • If you have brought a sample, your vet will do a visual observation of the stool or vomit
  • Palpitation of the abdomen to check for signs of an abdominal obstruction or pain
  • Check cardiovascular function to look for signs of blood loss or dehydration
  • Dog skin test to find out if your dog is dehydrated
  • Examination of your dog's mucus membranes to look for hemorrhagic losses

Will the vet run tests?

Following the basic examination, depending on your vet's findings, more diagnostic testing may be required. More advanced diagnostics used to determine the cause of bloody diarrhea and vomiting could include some of the following:

Routine biochemical/blood tests

  • Biochemical tests (e.g. liver, blood sugar)
  • Packed cell volume (hematocrit) data to confirm whether hemorrhagic gastroenteritis is the cause


  • To find any potential intestinal blockages, ulcers, tumors, or physical obstructions

Fecal Exam

  • Microscopic examination of your dog's stool to look for parasites or microbiological organisms

What is the treatment for bloody diarrhea or vomiting in dogs?

The course of treatment prescribed for your pooch will depend on the underlying cause of your pup's bloody stool or vomit, but may include:

  • Medications to soothe intestines
  • Electrolyte and fluid therapies for hemorrhagic gastroenteritis
  • Antibiotic therapy for certain types of infections
  • Corticosteroid therapy for cases of hypovolemic shock
  • Anthelmintics for parasitic infections
  • Surgical remedies for tumors, ulcers or physical obstructions

Will my dog be ok?

In most cases with proper treatment, dogs respond very well and recover quickly.  The main priority after your dog’s underlying issue is treated should be healing time, as the inflamed intestines will need time to recover. In some cases, a modified diet can help reduce gastrointestinal disorders and intestinal infections.

Your vet may recommend withholding food and/or water for 24 hours to give your dog's intestine a chance to rest. A bland diet for 3 to 7 days following the 24-hour rest period, then a gradual return to your dog’s normal diet, should help.

It's important to stay vigilant as your dog recovers since certain proteins or other elements may result in the problem recurring. In these cases, your dog may need a specialized hypoallergenic medical diet.

Is there a way to prevent bloody stool or vomiting from recurring?

After infections, some vets recommend restoring intestinal microflora by introducing food additives (such as synbiotics, probiotics and probiotics) to improve gut function and prevent infection from coming back.

If you feed your dog a homemade diet the formula should focus on ideal nutrient profiles along with energy density, depending on the issue being addressed. These diets can be less fatty and have more highly digestible nutrients. Always consult your veterinarian on any dietary changes, particularly if your dog has had problems with bloody diarrhea and vomit.

Note: The advice provided in this post is intended for informational purposes and does not constitute medical advice regarding pets. For an accurate diagnosis of your pet's condition, please make an appointment with your vet.

Have you noticed blood in your dog's stool or vomit? Our Board Certified Internal Medicine Specialist has experience in the diagnosis and treatment of conditions that can cause bloody stool or vomit to occur. Contact us to find out how to make an appointment for your pooch.

New Patients Welcome

Veterinary Medical And Surgical Group–OC (VMSG-OC) accepts new clients to our specialty services and 24/7 emergency services.

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Contact (949) 201-4100