Gastric torsion is a life-threatening emergency in dogs where the stomach fills with gas and rotates on itself, cutting off blood flow to the stomach, spleen, and other organs. Veterinarians call it gastric dilatation-volvulus, or GDV. Without emergency surgery, it is fatal. Even with treatment, roughly 14% of dogs don’t survive.
The condition almost exclusively affects dogs, particularly large and giant breeds with deep chests. It can develop in under an hour, and recognizing the early signs is the difference between getting to an emergency vet in time and losing a dog.
How the Stomach Twists
GDV involves two things happening together or in rapid sequence: the stomach bloats with gas (dilatation), and then it physically rotates (volvulus). The stomach can twist roughly 180 to more than 270 degrees. In experimental models, rotations of approximately 235 degrees have been documented, with the lower part of the stomach swinging underneath and flipping to the opposite side of the body.
This rotation pinches off both the entrance and exit of the stomach, trapping gas, food, and fluid inside. More critically, it compresses major blood vessels, including the large vein that returns blood from the lower body to the heart and the vein that drains the digestive organs. The result is a cascade: blood can’t circulate properly, blood pressure drops, the heart can’t pump effectively, and the stomach wall itself starts dying from lack of oxygen. The spleen, which is attached to the stomach by a ligament, often gets dragged along in the rotation and can lose its blood supply too.
Which Dogs Are Most at Risk
Breed is the single strongest predictor. A large study in the Journal of the American Veterinary Medical Association identified the breeds at highest risk:
- Great Dane: 10 times the risk of a mixed-breed dog
- Weimaraner: 4.6 times the risk
- Saint Bernard: 4.2 times the risk
- Gordon Setter: 4.1 times the risk
- Irish Setter: 3.5 times the risk
- Standard Poodle: 2.9 times the risk
Other breeds with elevated risk include Newfoundlands, Basset Hounds, Doberman Pinschers, and Chesapeake Bay Retrievers. If breeds with smaller sample sizes had been included in that ranking, Irish Wolfhounds, Borzois, Bloodhounds, and Mastiffs would also appear near the top.
The common thread is body shape. Dogs with a deep, narrow chest have more room for the stomach to move and flip. The ratio of chest depth to chest width appears to be an important independent predictor, which explains why even the relatively short Basset Hound carries the highest risk among breeds under 50 pounds. Age also matters: older dogs are more susceptible, likely because the ligaments holding the stomach in place loosen over time.
Signs to Recognize
The hallmark symptom is unproductive retching. Your dog looks like it’s trying to vomit but nothing comes up, or only small amounts of foam or saliva appear. This happens because the twisted stomach has sealed off its exit points.
Other early signs include restlessness (pacing, inability to settle), excessive drooling, and a visibly swollen or tight abdomen. The belly may feel hard and sound hollow if you tap it. As the condition progresses, the dog becomes weak, may collapse, and can go into shock. Pale gums, a rapid heart rate, and shallow breathing are signs that blood circulation is failing. Some dogs are found already lying down and unresponsive with an obviously distended abdomen.
The speed of onset varies, but GDV can go from first signs to cardiovascular collapse in one to two hours. If your dog is retching without producing anything and its abdomen looks bloated, treat it as an emergency.
What Happens at the Emergency Vet
The first priority is stabilizing the dog’s circulation with intravenous fluids, since the twisted stomach compresses major blood vessels and causes shock. The vet will also try to decompress the stomach, either by passing a tube down the throat into the stomach or, if the twist prevents that, by inserting a needle through the abdominal wall to release trapped gas.
Surgery follows as soon as the dog is stable enough to tolerate anesthesia. The surgeon untwists the stomach, assesses whether any portion of the stomach wall or spleen has died from oxygen deprivation, and removes any tissue that can’t be saved. The survival rate for dogs that undergo surgery is about 86%.
The most important part of the surgery is a procedure called gastropexy, where the surgeon permanently stitches the stomach to the inner body wall so it can’t rotate again. Without this step, more than 50% of dogs will experience another episode. With gastropexy, the recurrence rate drops to 6% to 10%.
Complications After Surgery
Surviving the surgery doesn’t mean the danger is completely over. The period when the stomach was twisted and blood-deprived triggers a bodywide inflammatory response, and several complications can follow.
Cardiac arrhythmias are common in the first 24 to 72 hours after surgery. The heart muscle can become dysfunctional from toxins released when blood flow returns to previously oxygen-starved tissue. Vets typically monitor the heart continuously during this window.
Gastric necrosis, where portions of the stomach wall die, is one of the most serious complications and a major factor in whether a dog survives. If necrosis is extensive, the prognosis worsens significantly. Digestive problems after surgery, including vomiting, regurgitation, and slow gut motility, are also common and usually resolve over days to weeks.
Reducing the Risk
For owners of high-risk breeds, the most effective prevention is prophylactic gastropexy, the same stomach-tacking procedure performed during emergency surgery, done electively before a torsion ever occurs. Many veterinarians recommend it for Great Danes, Irish Wolfhounds, and other giant breeds, and it can often be performed at the same time as spaying or neutering.
Feeding practices also play a role. Dogs fed a large volume of food in a single daily meal have a higher risk of GDV compared to dogs fed smaller, more frequent meals. Splitting your dog’s daily food into two or three meals is a straightforward way to reduce the chance.
Some commonly repeated advice turns out to lack scientific support, or even backfires. Raised food bowls, long recommended to prevent bloat, were actually associated with an increased risk of GDV in a major prospective study. Restricting water around mealtimes and wetting dry food before feeding also showed no protective benefit. And while many sources advise avoiding exercise immediately before or after eating, the same study found no advantage to restricting activity around meals. The most evidence-backed strategies remain feeding smaller portions, choosing gastropexy for high-risk breeds, and knowing the early warning signs well enough to act fast.