The reasons why the stool is like sheep’s feces with black color include dietary factors, constipation and gastrointestinal bleeding. 1. Dietary factors: due to the patient’s low water intake, consuming less fiber-containing food, etc., resulting in dry stools in the form of sheep’s poop grains. Due to the low water content in the stool, the color will appear black. 2. Constipation: Due to slow gastrointestinal peristalsis, a large amount of water in the feces is absorbed by the gastrointestinal tract, causing the feces to dry up and become lumpy and hard. Moreover, the dry and hard feces can easily rub the intestinal mucosa and cause bleeding of the intestinal mucosa. The feces accumulate in the intestines for a long time, and when they are discharged, they will be granular like sheep’s feces, and there may be oxidized blackened blood attached to them. 3. Bleeding in the digestive tract: If the patient has bleeding in the digestive tract, the blood will be discharged with the feces, resulting in blackened feces. Due to gastrointestinal bleeding, the gastrointestinal tract is dysfunctional, making it difficult to pass stools, resulting in granular stools. If patients often have stools that are granular like sheep’s poop and black in color, it is recommended that they go to the hospital in a timely manner. Improve the gastroenteroscopy and other tests to clarify the cause of the disease, and follow the doctor’s instructions for treatment, so as not to delay the condition.