Gastric Dilatation and Volvulus (GDV) is an acute life-threatening condition where the stomach fills with large amounts of air and then twists around effectively cutting off the outputs to the esophagus and intestine. It then continues to expand putting pressure on the mucosa, major vessels and diaphragm. Because of the constriction of major vessels returning to the heart, a dog will collapse from lack of oxygen and nutrients to vital organs. Underlying causes are still a mystery but most dogs affected are large breed, deep chested male dogs although any dog can experience GDV. There is a definite risk in dogs that have eaten large meals and then exercise. Bloat may be diagnosed by physical exam but radiographs and other testing is needed to show volvulus. Treatment involves decompressing the stomach with a stomach tube or a percutaneous catheter, shock treatment with IV fluids and emergency medications, surgery to correct the volvulus and identify and remove any necrotic areas of stomach or spleen. Mortality rate ranges from 15-40% in treated cases. There is no guaranteed prevention for GDV but gastropexy can reduce the risk. Attention to diet, feeding and exercise may also prevent gastric dilation.