Contact your veterinarian.
People sometimes take their internal body health for granted.
They can't see the stomach churning and digesting food, and most people wouldn't want to even if they could. However, in the case of a dog's stomach, sometimes what can't be seen will not only cause pain, it could even cause death. Dog breeds most commonly affected are German shepherds, great Danes, Doberman pinschers, and Irish setters. First, it distends and balloons up with gas and fluid, in addition to food that is already present. Then, the organ literally takes a turn for the worst, rotating from its original position and often twisting the attached spleen right along with it.