Other organs may also be compromised. Technically, the occurrence is gastric dilatation-volvulus. It's onset is sudden and life threatening. Immediate medical attention is required where immediate means right now, not after you finish dinner, right now. And remember, your local vet may not be open, and if they are open, they might not be staffed to handle a bloat emergency.
Time is of the essence.
However if you do get your dog to the ER fast, your dog's chances increase significantly as most dogs do well after surgery. At the Tufts University School of Veterinary Medicine, about 85 percent survive after surgery. Oddly restless after eating 2. Unable to sit down comfortably or lie down 3. Nervous pacing with a purpose 4.