7 warning signs in your dog’s poop that indicate a potential health issue: 1. Blood in Stool Bright red blood → could indicate irritation in the lower digestive tract. Dark/black stool → may signal bleeding higher up in the gut. 2. Mucus in Stool Small amounts can be normal, but large amounts may indicate infection, inflammation, or digestive upset. 3. Diarrhea Frequent, watery stools can indicate infection, dietary changes, stress, or parasites. Persistent diarrhea needs vet attention. 4. Const