I- Biology of the Gastrointestinal Tract II- Approach to Clinical Signs in Gastrointestinal Disease III- Diagnostic Approach to Gastrointestinal Disease (Laboratory Testing, Diagnostic Imaging, Endoscopy, Laparoscopy, Histopathology) IV- Nutritional Approach to Gastrointestinal Disease V- Pharmacologic Approach to Gastrointestinal Disease VI- Disease of the Gastrointestinal Tract