An appendix is a thin tube in the lower right abdomen. It sits where the small intestine meets the large intestine. According to some theories, it’s an evolutionary holdover that provides no benefits to the health. Other theories proved that the appendix acts as a storehouse for good bacteria, rebooting the digestive system after diarrhea. The Bacteria in the appendix re-inoculate the colon with healthy bacteria after the ‘flood’ is over. The appendix does get attention usually because it becomes infected and causes Appendicitis. Appendicitis typically starts with a pain in the middle of the abdomen and some symptoms such as intense abdominal pain, nausea, vomiting or fever will follow. These symptoms may appear in dogs, but they’re most likely from something else, not a vulnerable appendix. In most cases of appendicitis, the appendix needs to be surgically removed as soon as possible.