On Monday in Part 4 of this excerpt from the new book Equine ER , we took a deeper look at the prison farm program where an inmate met Marching Orders, the stoic Thoroughbred with the big heart. Today, we go back into the operating room and find out what the surgeon discovered with Marching Orders on the table. In the operating room, what surgeon Scott Hopper found was a diaphragmatic hernia – a hole...