What is bloat?
This is an imminently fatal dog digestive disorder where the stomach fills up with gas and then (typically) twists over, preventing the gas from escaping. You must get the dog to the veterinary hospital immediately. The twisted stomach cuts off blood flow to internal organs. Bloated dogs almost always die if the condition is not caught within a few hours. The symptoms are that the dog can’t get comfortable, tries to burp but can’t, and–most importantly–has a hard, swollen, round belly. Here is a web site with information: canine bloat.