My dog ate honey, vomited all night, and now has dark purple stool. What should I do?

Your dog has diarrhea and bloody stool, and the dark purple stool you describe is a sign of hemorrhagic enteritis, likely caused by bacterial or viral gastroenteritis. If the stool is foul-smelling and the dog is not fully vaccinated, take it to a veterinary hospital to check for parvovirus or coronavirus, which is serious with high mortality and needs systematic hospital treatment. If viral infection is ruled out, the symptoms may come from improper diet or intestinal parasites; in that case fast and withhold water for 6 to 8 hours, and after vomiting stops give compounds such as veterinary amoxicillin powder, bismuth subcarbonate, and cimetidine tablets to reduce inflammation, stop diarrhea, and stop vomiting. Watch the symptoms; if vomiting stops, feed a small amount of warm-water-softened kibble with pet probiotics to restore gut flora..