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Melena is a form of blood in stool which refers to the dark black, tarry feces that are commonly associated with upper gastrointestinal bleeding. [1] The black color and characteristic strong odor are caused by hemoglobin in the blood being altered by digestive enzymes and intestinal bacteria. [2]
Cancer is the leading cause of death in dogs. [1] It is estimated that 1 in 3 domestic dogs will develop cancer, ... Black, tarry stools (a symptom of ulcers, which ...
Blood in stool looks different depending on how early it enters the digestive tract—and thus how much digestive action it has been exposed to—and how much there is. The term can refer either to melena, with a black appearance, typically originating from upper gastrointestinal bleeding; or to hematochezia, with a red color, typically originating from lower gastrointestinal bleeding. [6]
Gastroenterologists break down the biggest potential causes of black poop, plus what to do next.
A number of foods and medications can turn the stool either red or black in the absence of bleeding. [2] Bismuth found in many antacids may turn stools black as may activated charcoal. [2] Blood from the vagina or urinary tract may also be confused with blood in the stool. [2]
(Find out the 9 most common reasons why your poop is black.) ... As noted by Dr. O’Connor, certain drugs and supplements can cause the stool to appear pale or clay-like.
Naproxen (Aleve)* has a long half-life in dogs and can cause gastrointestinal irritation, anemia, melena (digested blood in feces), and vomiting. [175] Antifreeze* is very dangerous to dogs and causes central nervous system depression and acute kidney injury. Treatment needs to be within eight hours of ingestion to be successful. [174]
Skin conditions in dogs are very common, so it's important to recognize the symptoms and understand the factors that cause them. Dr. Rebecca MacMillan, a vet with over 15 years of experience, says ...