If there is blood or mucus or it has lasted more than a few days, go to your vet! An intestinal problem may be due to parasites, diet changes or eating something different, bacteria or a symptom of a more serious condition. Do not wait too long to address this problem as your cat may have fluid and nutrient loss that may result in death if you don’t get treatment. The vet will try and determine if the intestinal problem is in the large or small intestine. Frequency is increased in both cases but in some cases the volume is increased and in others it is the same or decreased.
Food allergies (eg. milk) and a switch in your cat’s food can cause diarrhea but more serious conditions include: inflammatory bowel disease, blockage due to hairballs, drugs or toxins, liver or kidney disease, hyperthyroidism, neoplasia, pancreatitis, toxins (eating plants or other poisons), and bacterial infections.