A 7-year-old male castrated Swiss Mountain Dog presented to Cornell's Emergency Service for lethargy and abdominal distention. On presentation the patient was in hypovolemic shock with a severely distended, painful, tympanic abdomen. A right lateral abdominal radio graph revealed gastric dilatation with volvulus and no evidence of gastric rupture and the patient underwent emergency surgery. Following gastric de-rotation an area of necrotic tissue was noted along the greater curvature of the stomach intra-operatively. The stomach was palpated and a small foreign body was identified within the lumen. A partial gastrectomy with concurrent foreign body removal and an incisional gastropexy were performed. Post-operatively the patient was maintained on fluid therapy, anti-emetics, gastroprotectants, enteral nutrition, anti­-arrhythmics, pro-kinetics, and pain medications. The objective of this case report is to review the presentation, pathophysiology, risk factors, initial stabilization, current-literature, surgical management, and post-operative care of a gastric dilatation volvulus in the canine patient.