Black and runny stool in cats can be a serious symptom and should be addressed by a veterinarian immediately.
Here are some potential causes of black and runny stool in cats:
* Blood in the stool: This can be caused by various factors, including ulcers, tumors, parasites, or inflammatory bowel disease.
* Digestive issues: Diarrhea and changes in stool color can be caused by food sensitivities, bacterial infections, or changes in diet.
* Internal bleeding: Black stool can be a sign of internal bleeding, which can be caused by various underlying conditions.
It is crucial to seek veterinary attention immediately if your cat exhibits these symptoms. Your veterinarian can perform a thorough examination, run tests, and determine the underlying cause to provide appropriate treatment.
Please remember: I am not a veterinarian, and this information is not a substitute for professional medical advice.