Hemorrhagic Gastroenteritis is a disorder that causes vomiting and diarrhoea that contains either fresh blood or digested blood. This disorder is abrupt at the onset and the cause of it is unknown. Diagnosing the disorder is a matter of eliminating other disorders that cause similar symptoms. This disorder needs medical treatment. Although it will run its course within a few days, the dog needs a treatment of intravenous fluids to keep hydrated. If the dog becomes dehydrated, its red blood count will continue to rise until the blood becomes thick and slow moving through blood vessels. This can cause another disorder called disseminated intravascular coagulation and can result in death. The disorder is also treated with antibiotics and anti-ulcer medications as well as the intravenous fluids.