If you’ve read the book or watched the movie Marley and Me, then you probably remember the bloating scene. Bloating or worse, a GDV, Gastric Dilatation-Volvulus, affects deep-chested dogs such as German Shepherds, Great Danes, Dobermans, and Bassett Hounds. Great Danes are the number one breed for bloat and GDV. Bloat is when the stomach greatly expands in size, usually with air, but can also occur with food. This can be resolved by passing a stomach tube, administering simethicone, or a number of other ways. A GDV is when the stomach enlarges in size and then twists on itself.