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Gastroscopy allows the internist to closely examine an animal’s esophagus, stomach, and the first portion of the small intestine. The health of these tissues can be assessed, biopsies harvested, and sometimes foreign objects can be retrieved. The pet is fasted at least 12 hours prior to the procedure and is usually released on the same day. Common reasons for gastroscopy are weight loss, vomiting, diarrhea, and anorexia.