Bloody Stool In Dogs – Causes of Blood in Dog Stool

Bloody Stool In Dogs | Seeing blood in your pet’s stool can be a rather frightening occasion, maybe because we frequently associate blood in feces. . Luckily, in dogs the causes are frequently a lot less dramatic. Naturally, as a responsible pet owner, it is always savvy to possess the possible causes researched by a veterinarian in order to rule out the more significant conditions.

Blood in feces is medically called hematochezia or melena based on if the blood comes from the dog’s upper or lower digestive system, respectively. It is very important to recognize the differences between the two since they can signify a difference in your dog’s diagnosis. Following are some ways to tell them apart.

In hematochezia, the blood in the dog’s stool is bright red, meaning it’s fresh and probably deriving in the intestines, typically the colon or the rectum. It may be mixed in your dog’s stools, or you are able to see several droplets of blood vessels as your dog defecates.

In melena, the blood in the stools causes feces to appear tarry and asphalt, suggesting the blood is digested and potentially coming out of the upper intestinal tract. Normally, but not always, melena is more worrisome than the occasional case of hematochezia. Melena is frequently not easily recognizable as hematochezia since dogs might frequently have dark stools which doesn’t necessarily mean that they have blood in them.

So how do you tell whether dark stools contain blood? Watch to see whether or not a reddish tint diffuses from the stool–if it does, that’s proof that you’re probably dealing with melena.

The causes of blood in stools could be various and range from minor issues, such as dietary changes, to more acute causes, like cancer or parvo. Following are some common causes of blood in dog feces you might want to have researched by your veterinarian.

Dog Hematochezia Versus Melena


  • Bright red blood in feces
  • Fresh blood


  • Tarry black feces
  • Digested blood
  • Derives from stomach, stomach, or upper small intestine

Common Causes of Fresh Bright Red Blood in Stool

As previously mentioned, hematochezia is refreshing, bright red blood in, or blended with, your dog’s stool. Unlike in humans, in dogs new blood is not indicative of migraines. The stripes of bright red blood in stool probably come in the dog’s rectum or colon. It is best to have hematochezia investigated promptly by a vet, since some possible causes of the condition can be severe. Here are a few of the root of hematochezia in puppies.


This is a significant illness often found in dogs. Black-and-tan breeds, such as rottweilers, German shepherds, and Dobermans, are more inclined to parvo. Normally, a puppy with parvo will exhibit vomiting, diarrhea, lethargy, loss of appetite, and blood in stools. Since this disorder can be deadly, dogs suspected of getting parvo ought to be seen by a vet promptly.


Parasites are one of the most frequent causes of blood in the stool. The most common parasites that cause blood in the stool are hookworms, whipworms, and roundworms. Protozoans such as coccidia may also cause bloody stools. A veterinarian can determine the offending parasites and prescribe specific dewormers to help get rid of these annoying beings.

Dietary Indiscretions

Changes in the dog’s diet may have similar effects. If a diet modification is completed also suddenly, vomiting and diarrhea may occur. Even giving your dog a fresh treat or ingesting him food can lead to an inflamed colon.

Other nutritional causes of blood in the stool include eating spoiled foods and food intolerances or allergies.

Mild cases of stomach upset can be treated with these very simple dog upset stomach remedies.

Hemorrhagic Gastroenteritis

Hemorrhagic gastroenteritis entails copious blood in stools along with vomiting and diarrhea. Frequently the cause can’t be found, but your dog may require intravenous fluids and appropriate medications to allow this condition subside.

Rectal Injuries

If a dog ingests a rod, bone, or other sharp object, it might eventually scrape the reduced intestinal lining or anus because it makes its way out via the feces. Often, you might place the thing visibly protruding out of the feces once it’s worked its way through your dog’s body. In these cases, the blood is bright red and will eventually stop. Avoid giving your pet sticks or cooked bones to perform with.

Also, check for any rectal accidents, especially any involving the anal glands. Look for almost any localized swelling, accidents, or protrusions.

If the dog’s stools are well-formed and have fresh blood on the outside, this may be indicative of the presence of a rectal polyp, which is an abnormal growth. When the stools pass over the polyp, which is highly vascularized, it is going to bleed. At times you can observe polyps protruding externally, but they can also be internal, in which case an endoscopy could be necessary in order to see it. In accordance with Merck Veterinary Manual, “The polyp could be felt by a vet during a rectal examination, and also its surface tends to bleed easily. All of polyps should be checked by a vet since occasionally they can be cancerous.


Sometimes, blood in the stools might be caused by stress. Stressful life events for a puppy include modifications such as a move, the accession of a new dog or family member into the household, and being boarded in a kennel. These events might make a case of colitis with bloody diarrhea with mucus. For more on this, read Can Blood in a Dog’s Stool Be Caused by Stress?

Causes for Melena, Dark Tar-Like Stools in Dogs

As mentioned, melena is the medical term for blood in the dog’s stools, which makes them look black and tarry. Some pet owners clarify such stool as looking like “coffee grounds .” Because melena may be due to serious conditions, including acute bleeding, it also needs to be investigated by a vet.


If your dog is on aspirin or some type of Non Steroidal Anti-Inflammatory drug like Rimadyl or aspirin, he might develop ulcers from its use. Dogs with bleeding sores will typically possess black tarry stools significance digested blood is coming from the stomach. Inform your vet promptly if your puppy is on these medications, and always keep a watchful eye on his stools.

Blood Clotting Disorders

There are several canine conditions that might result in blood clotting disorders and bleeding. Affected dogs may also exhibit symptoms other than black tarry stools, such as purple-tinted skin, indicating bleeding beneath the surface. Rat poison may also cause blood clotting disorders and bleeding, which may manifest as dark tarry stools.

Post-Surgery Complication

If your pet has undergone some type of surgery lately and has black stools, call your veterinarian immediately. There can be internal bleeding someplace. This complication may seem up to 72 hours after the surgery.


Anytime your dog gifts dark, blackish stools, have your puppy seen. You want to rule out the possibility of bleeding tumors such as polyps or cancer, which can be quite common in older dogs.


On a lighter note, if you’ve recently given Pepto-Bismol for your puppy, the medication may temporarily turn stools black. This possible side effect is actually written on the bottle if you read it. When you stop giving it, the stools should soon shortly turn back to normal.

Ingestion of Blood

For example, your dog might have licked a damn wound, or he may have had a mouth injury or nose bleed causing him to swallow blood. Because the blood may come from a bleeding ulcer, it is important to see your vet if you see dark stools and cannot find an excuse.

More Reasons

As seen, there are lots of potential causes of blood in stool. Those listed above aren’t the only possibilities. Others include:

  • Intestinal blockages
  • Fissures
  • Trauma
  • Cancerous masses
  • Bacterial infections, such as those caused by campylobacter or clostridium perfringens


You’ll need to give a thorough record of your pet’s health and beginning of symptoms. Your vet will perform a complete physical examination on your pet, including a blood chemical profile, a full blood count, an electrolyte panel along with a urinalysis. If an underlying illness is causing infection or inflammation of any part of the intestinal tract, the blood count should show this.

Your doctor can also use x-ray imaging to inspect the abdominal area. This diagnostic method could detect many of the ailments which affect the gastrointestinal tract, including foreign bodies from the stomach or intestinal tract, or inner fractures. An abdominal ultrasound can deliver even greater visualization than an x-ray, enabling your veterinarian to detect disorder of the prostate, or masses at the lower stomach.

Your veterinarian may also use another useful diagnostic process to visually inspect the inner space and to take a tissue sample for lab testing. A colonoscope or proctoscope, each of which are extremely slender instruments which are made to be guided into and through the body’s internal pathways — in this instance the rectum. These tools have micro cameras attached at the end so that your veterinarian can observe the inner space, and that can also be outfitted with a tool for carrying a tissue samples for biopsy. These tools are especially useful for the diagnosis of inflammatory diseases or cancer.


Many patients with dyschezia and hematochezia might be treated on an outpatient basis unless the underlying illness is severe enough to require supportive care. For example, dehydration or internal bleeding will have to be brought under control prior to additional treatment can be undertaken.

Balloon dilation can be utilized to relieve strictures of the intestinal canal. This process widens the canal softly and slowly, using a balloon, so that clogged feces can be released.

Rectoanal diseases, such as hernias of the perineum (the space between the genital and the anus), or rectoanal polyps may need surgical correction. Your vet may also prescribe antibiotics, anti-inflammatory drugs, or antidepressants, based on the underlying cause of this disease. Laxatives may be used to ease defecation if rectoanal disease is present.

Living and Direction

Your vet will schedule follow-up appointments as required to continue treatment of your pet’s underlying condition, to evaluate your pet’s progress, and also to modify the therapy as it becomes crucial.

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