Pet Black Stool Symptom Guide | What to Watch For and When to See a Veterinarian
Understand possible causes of black stool and key points for home observation
Black, tarry stool, or melena, usually means blood has been digested in the gastrointestinal tract. It often suggests bleeding from the stomach or upper small intestine, though swallowed blood, medications, or supplements can sometimes look similar.
Black stool may indicate upper gastrointestinal bleeding and needs urgent evaluation
Black, sticky, tar-like stool is often blood that has been digested and oxidized in the gastrointestinal tract. It may represent a current or recent bleeding source and requires prompt assessment of cause and severity.
Recommended Action
Contact a veterinarian immediately or take your pet to an animal hospital with emergency services for evaluation.
What this symptom means clinically
Black, tarry stool, or melena, usually means blood has been digested in the gastrointestinal tract. It often suggests bleeding from the stomach or upper small intestine, though swallowed blood, medications, or supplements can sometimes look similar.
🐱 In cats
Black stool in cats may indicate upper gastrointestinal bleeding or swallowed blood; stool color change is an important clue because cats hide discomfort.
🐶 In dogs
Dogs may develop tarry stool after indiscriminate eating, foreign material, medications, or digested upper gastrointestinal blood.
Clinical signs you can observe
Check whether your pet shows any of the signs below. If several apply, seek veterinary care promptly.
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Possibly Related Conditions
Conditions owners commonly find associated with this symptom — tap to learn more.
Intussusception
Inflammatory or structural changes disrupt normal digestive processes. The gastrointestinal compromise presents as melena.
Acute Abdomen
Disease-induced tissue damage alters gut barrier function and secretion. This GI pathology manifests as melena.
Acute Diarrhea
Inflammatory or structural changes disrupt normal digestive processes. The gastrointestinal compromise presents as melena.
Acute Vomiting
Disease-induced tissue damage alters gut barrier function and secretion. This GI pathology manifests as melena.
Adenocarcinoma, Stomach, Small and Large Intestine, Rectal
Tumor growth causes mass effect and mucosal invasion in the GI tract. The resulting tissue disruption leads to melena.
Anemia, Aplastic
Disease-induced tissue damage alters gut barrier function and secretion. This GI pathology manifests as melena.
This page helps owners understand symptoms and recognise risk; it cannot replace an in-person veterinary examination, diagnosis or treatment. If your pet shows any symptoms, please consult a qualified veterinarian as soon as possible.