Many cases of acute gastritis are short lived, resolve easily, and an extensive diagnostic evaluation is seldom required. Diagnostics should be performed in those individuals whose gastritis is severe, chronic, or are exhibiting systemic signs of illness. A thorough history and physical examination is of paramount importance prior to diagnostic evaluation. Complete blood count (CBC), biochemical profile, urinalysis, and fecal examination
Abdominal radiographs (X-rays) +/- contrast/dye evaluation
Parvo test on all puppies
Abdominal ultrasound in selected cases
Endoscopy in selected cases
There are several things your veterinarian may recommend to symptomatically treat your dog. The principal goals of symptomatic therapy are to restore and maintain fluid and electrolyte balance, and to completely rest the gastrointestinal tract.
Nothing orally (NPO) for a several hours, with a gradual introduction of water followed by a bland diet
Fluid and electrolyte therapy as indicated in the dehydrated patient
Antiemetics (drugs that symptomatically decrease the frequency of vomiting)
Antacids (drugs that block acid production by the stomach)
Gastric protectants (drugs that coat and soothe the GI tract)
The primary recommendation is to withhold all food and water until contacting your veterinarian. Administer medication and diet only as directed by your veterinarian and observe your dog very closely. If clinical signs are not improving, and/or your dog is getting worse, have your dog evaluated at once.