Vomiting and diarrhea are two of the most common reasons we see our patients for sick visits. Unfortunately, they are symptoms of many different conditions and can cause a range of side effects. It is important to have your pet examined, because a medication that may benefit one pet may make a second one ill, even with the same symptoms. In addition, some pets can suffer other consequences, such as dehydration, that can make recovery much slower and can be remedied in the hospital.