IBS and IBD are different health issues. IBS is an issue of gut motility and does not involve inflammation. IBD, on the other hand, is a broad term used to describe a group of diseases that involve an abnormal immune response causing irritation or inflammation of the digestive tract. But both issues can cause similar symptoms, such as chronic vomiting, chronic diarrhea, weight loss, and a sensitive stomach. See our guide to IBD and IBS in dogs for more information.