Gastric Dilatation-Volvulus (Bloat) in Dogs

Gastric dilatation-volvulus (GDV), commonly known as "bloat" or "gastric torsion," is a sudden, life-threatening emergency in dogs. It happens in two stages. First, the stomach fills and expands with excess gas (dilatation). In more serious cases, the distended stomach then twists on itself (volvulus), rotating anywhere from 90° to 360°. That twist can trap gas inside by blocking the esophagus, preventing your dog from being able to belch or vomit to relieve the pressure.

GDV is one of the more common true emergencies seen in dogs. As the stomach continues to expand and twist, it puts increasing pressure on surrounding organs and blood vessels, which can lead to reduced blood flow (perfusion) throughout the body - and without oxygen-rich blood reaching them, organs can begin to fail. Even with prompt treatment, GDV carries a real risk of death: reported mortality rates in treated dogs generally range from about 20% to 45%, with some studies citing figures as high as 60% depending on severity and how quickly treatment begins.

If your dog shows these signs, especially the combination of a distended abdomen and unproductive retching - this is an emergency. Don't wait to see if it resolves on its own; head to your vet or the nearest emergency clinic immediately.

• Physical signs

  Rapid heartbeat (tachycardia), labored breathing, weak pulse, pale gums or mucous membranes, and signs of shock.

• Behavioral signs

  Abdominal pain and visible distension, restlessness or anxious behavior, depression or lethargy, collapse, excessive drooling, and repeated, unproductive retching (trying to vomit without bringing anything up).

The exact cause of GDV isn't fully understood, but several risk factors are well established.

• Genetics and body type

  Large, deep-chested breeds face the highest risk. Great Danes, Saint Bernards, Weimaraners, German Shepherds, Irish Setters, Gordon Setters, Standard Poodles, and Basset Hounds are all consistently identified as higher-risk breeds. Reported lifetime risk for Great Danes specifically ranges from roughly 14% to over 40% depending on the study, making them one of the most affected breeds. Dogs with a parent or sibling that's had GDV are at increased risk themselves, and risk generally increases with age, though it has occasionally been reported in puppies.

• Environment and habits

  Risk factors linked to environment and feeding include eating large volumes of food or water at once, eating too quickly, high activity levels shortly after eating, and slow gastric emptying. Feeding only dry kibble and eating just once a day have also been associated with increased risk.

Diagnosis typically involves bloodwork - including lactate levels, which can help gauge severity - along with abdominal X-rays to confirm the stomach's position and rule out other causes.

Other conditions can look similar to GDV, including bacterial infections, gastroenteritis (inflammation of the digestive tract), or simple overeating (sometimes called "food bloat," which doesn't involve twisting). Because GDV is a true emergency and these other conditions aren't, your vet will move quickly to rule GDV in or out.

After treatment, dogs typically need pain medication and other supportive care during recovery. Activity should be restricted for about two weeks, particularly following surgery, to allow proper healing.

Without surgical correction, GDV recurs in a large majority of dogs. Reported recurrence rates run as high as 80% in dogs treated with decompression alone and no gastropexy, compared to under 5% in dogs who've had the surgery. This is a big part of why gastropexy is so strongly recommended after a GDV episode - and in high-risk breeds, some veterinarians recommend performing it proactively, often at the same time as spay or neuter surgery.

Other steps that can help reduce risk include avoiding strenuous exercise right after eating or drinking, slowing your dog's rate of food consumption (slow-feeder bowls can help), and feeding smaller, more frequent meals rather than one or two large ones.