Intestinal upset in dogs is caused by improper diet, indigestion, and internal parasites. It usually occurs in puppies. When a dog turns its intestines, it will develop symptoms such as vomiting, diarrhea, bloody stools, loss of appetite, etc. In severe cases, it may even lead to death. Therefore, once it is discovered, take the dog to the pet hospital for examination in time to confirm the cause and then treat it to avoid delaying the condition.