My Dog’s Poop Is Black - Does This Indicate Anything?

If you’ve noticed that your dog’s stool is black, it’s natural to be concerned. While diet and minor changes can sometimes cause dark stool, black, tar-like poop - known as melena - can be a sign of bleeding in your dog’s upper gastrointestinal tract. Understanding what this could mean and when to seek professional care is essential for your pet’s health.
 

What Causes Black Poop in Dogs?

Black stool often indicates the presence of digested blood. This typically means the bleeding is happening higher up in the digestive system, such as the stomach or small intestines. Common causes include:

• Gastrointestinal ulcers - Often caused by medications like NSAIDs or underlying health conditions.

• Ingested blood - If your dog licked or swallowed blood from a mouth injury or nosebleed, it could darken the stool.

• Toxins or foreign objects - Consuming harmful substances or objects can cause internal irritation or bleeding.

• Tumors or cancer - Gastrointestinal tumors may lead to internal bleeding and dark stool.

• Dietary factors - Foods or supplements high in iron or dark pigments (like liver or charcoal) can sometimes mimic black stool without underlying illness.
 

When to See a Veterinarian

While a one-time dark stool may not always mean trouble, persistent black or tarry poop should never be ignored. Contact your Arlington veterinarian if you notice:

• Ongoing black or tar-like stools

• Vomiting or loss of appetite

• Pale gums or signs of weakness

• Abdominal pain or bloating

These symptoms could point to internal bleeding or another serious condition requiring immediate attention.
 

How Veterinarians Diagnose the Cause

At Dr. Mike’s Affordable Vet Care, we take a thorough and compassionate approach to diagnosing the cause of your dog’s symptoms. To get a clear understanding of what’s going on, your Arlington veterinarian may recommend diagnostic tests such as bloodwork and fecal testing to check for infection or internal bleeding.  In some cases, X-rays or ultrasound imaging are used to evaluate the stomach and intestines, while endoscopic examinations allow the vet to visually inspect the gastrointestinal tract for ulcers, foreign objects, or other abnormalities. These diagnostic tools help pinpoint whether your dog is experiencing bleeding, infection, or a blockage that needs treatment.
 

Treatment Options

Treatment depends on the underlying cause. For example:

• Ulcers may require antacids or protective medications.

• Infections may be treated with antibiotics.

• Foreign objects or tumors may need surgical intervention. Prompt veterinary attention ensures your dog gets the care they need before the condition worsens.
 

Schedule a Visit with Our Trusted Arlington Vet

Black poop in dogs shouldn’t be taken lightly - it’s often a sign that something more serious may be happening inside your pet’s digestive system. Early intervention can make a big difference in recovery and overall health.

If you notice black or tar-like stool in your dog, schedule an exam with Dr. Mike’s Affordable Vet Care for affordable vet care in Arlington, Texas. Call (817) 663-8160 to book an appointment today.