Bloat & GDV in Dogs: An Educational Guide for Owners Gastric dilation occurs when a dog’s stomach fills with gas or fluid. In some cases, this can progress to gastric dilation with volvulus (GDV) — a condition where the stomach twists and traps its contents. GDV is a life‑threatening emergency, as the twist seals off both entry and exit points, causing rapid gas build‑up and affecting blood flow to vital organs. Understanding the signs and acting quickly can save a dog’s life