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 li