If a dog has diarrhea and is vomiting, the vet may ask the owner to withheld food for 24 hours, may prescribe prescription food, or there is risk of dehydration, administer fluids and anti-vomiting medications intravenously to the pet, according to the VCAHospitals.com. The exact treatment varies depending on the illness.
Gastroenteritis is the most common cause of diarrhea and vomiting among dogs, states VetStreet.com. Rehydration is the principal treatment and may be administered orally, subcutaneously or intravenously depending on the severity of dehydration. A vet may also prescribe antibiotics in case of bacterial infection and antidiarrheal agents to alter the dog's intestinal activity. A pet may show improvement from the disease after 48 hours, according to the VCA Animal Hospital. If the symptoms continue or worsen, another set of tests should be carried out.
A veterinarian diagnoses the pet through the process of elimination, discloses the VCA Animal Hospital. The owner should provide the dog's medical history and answer diagnostic questions from the vet. A vet also takes the dog's vital signs and performs a physical examination to check for other symptoms such as abdominal pain, dehydration, swelling, bloating or gas, and other abnormalities. Diagnostic testing may include a complete blood count and urinalysis. Depending on the other symptoms, a vet may also suggest an abdominal radiograph and ultrasound.