Bloat (Gastric Dilatation-Volvulus)

Gastric dilatation-volvulus (GDV) is a surgical emergency. The stomach fills with gas (dilatation) and rotates on its axis (volvulus), trapping the gas inside. The rotation cuts off blood supply to the stomach wall and spleen, causing rapid tissue death. Without emergency surgery, GDV is fatal - typically within hours of onset.

Gastric dilatation without volvulus (bloat without the twist) is less immediately life-threatening but still requires urgent veterinary attention, as it can progress to GDV.

At-risk breeds and risk factors

Breed and conformation are the strongest risk factors. Deep-chested breeds - those with a chest depth-to-width ratio greater than approximately 1.5 - are at significantly higher risk. The highest-risk breeds include Great Danes (roughly 40% lifetime risk), German Shepherds, Standard Poodles, Weimaraners, Dobermanns, Irish Wolfhounds, Irish Setters, and Akitas. Labrador Retrievers and Golden Retrievers have moderate risk.

Age. Risk increases with age. GDV is most common in dogs over seven.

Previously bloated. A dog who has had gastric dilatation (without volvulus) is at higher lifetime risk of future episodes.

Having a first-degree relative with GDV. Genetic predisposition appears to play a role.

Feeding factors. A single large meal once a day, feeding from a raised bowl (for most dogs - evidence is contradictory), and vigorous exercise immediately before or after eating have been associated with GDV in some studies, though causality is not firmly established for all.

Stress. Some studies suggest fearful or anxious temperament is associated with increased risk.

Recognising GDV

Time is everything. Know these signs:

• Unproductive retching - the dog repeatedly attempts to vomit and produces nothing, or only small amounts of foamy saliva
• Distended abdomen - the belly appears swollen, tight, or drum-like; may be visibly larger on the left side
• Restlessness and inability to settle - a dog who cannot get comfortable, paces, and tries to find a position to relieve discomfort
• Drooling excessively
• Rapid, shallow breathing
• Pale gums - as shock develops
• Collapse - in later stages

If you observe any combination of unproductive retching and abdominal distension in a deep-chested breed: go to the emergency vet immediately. Do not wait.

This is not a condition where monitoring overnight is appropriate.

Preventive gastropexy

For high-risk breeds, prophylactic gastropexy - a surgical procedure that permanently attaches the stomach to the body wall, preventing rotation - is strongly recommended. It does not prevent dilatation but prevents the twist, which is the life-threatening component.

Gastropexy is often performed at the time of neutering to avoid an additional anaesthetic episode. Laparoscopic (keyhole) gastropexy is widely available at referral centres and many larger UK practices, with faster recovery than open surgery.

If you have a Great Dane, German Shepherd, Standard Poodle, or other high-risk breed, discuss prophylactic gastropexy with your vet proactively.

Post-GDV monitoring

For dogs who have had surgery for GDV, the risks going forward include:

• Cardiac arrhythmias - common in the 24–72 hours post-surgery and a significant cause of post-operative mortality; monitoring in hospital is critical
• Gastric wall necrosis - if blood supply was interrupted long enough for stomach tissue to die; may require removal of affected tissue at surgery
• Future episodes - a dog who has had GDV without gastropexy is at high risk of recurrence; gastropexy is usually performed at the time of GDV surgery if not already done

Log any signs of abdominal discomfort, retching, or behavioural changes in the days after discharge from hospital.

When to contact your vet

Go immediately to the nearest emergency practice if:

• Unproductive retching + abdominal distension in any deep-chested breed
• Any of the signs listed above in a high-risk breed

There is no "watch and see" option with suspected GDV.

Frequently Asked Questions

Can GDV happen to non-deep-chested breeds? Yes, though it is significantly less common. Any dog can potentially develop GDV, but the risk is dramatically higher in the deep-chested breeds listed above.

Is a raised food bowl safe for large breeds? Evidence is contradictory - some studies suggested raised bowls increased risk; more recent data doesn't support this as a clear risk factor. If you're concerned, feeding at floor level and avoiding a single large daily meal are reasonable precautions. Discuss with your vet.

My dog had bloat once but didn't need surgery. Is it safe? Simple dilatation without volvulus that resolved may not require emergency surgery, but it significantly increases lifetime risk of GDV. Prophylactic gastropexy should be seriously considered. Discuss with your vet.

How much does GDV surgery cost? GDV is a major emergency surgery. Costs typically range from £2,000–£5,000 depending on the practice and complexity, and may be higher if gastric or splenic tissue requires removal. Emergency out-of-hours rates apply. Pet insurance with a lifetime policy is strongly recommended for high-risk breeds.

Is prophylactic gastropexy worth it? For Great Danes and other very high-risk breeds, yes - strongly so. The lifetime risk of GDV in a Great Dane is approximately 40%; the procedure significantly reduces the risk of the life-threatening volvulus component. The risk of the procedure itself is low, particularly when done laparoscopically.