CONDITION

Gastric Dilatation-Volvulus (GDV/Bloat)

Why this matters now

GDV predominantly affects large and giant breed dogs, particularly those with deep, narrow chests such as Great Danes, German Shepherds, Standard Poodles, and Irish Setters. The condition can occur at any age but is more common in middle-aged to older dogs. Episodes often occur in the evening, sometimes following a meal or exercise.

GDV typically develops rapidly, progressing from initial stomach distension to a twisted stomach within hours or less. Once the stomach rotates, blood supply becomes compromised, and the condition escalates quickly. Without intervention, cardiovascular shock develops as blood return to the heart is impeded. The window for successful treatment narrows as the condition progresses.

Signals & patterns

Early signals

Restlessness and inability to settle

Affected dogs often pace, change position frequently, and appear uncomfortable, unable to find a comfortable resting position.

Non-productive retching

Attempts to vomit that produce little or nothing are characteristic, as the twisted stomach prevents normal emptying.

Visible abdominal enlargement

The abdomen may appear distended or bloated, particularly on the left side behind the ribs.

Excessive drooling

Increased salivation often accompanies nausea and inability to vomit effectively.

Later signals

Rapid, shallow breathing

The enlarged stomach presses on the diaphragm and cardiovascular changes develop, affecting breathing.

Pale or grey gums

Poor circulation causes gum colour changes, indicating cardiovascular compromise.

Weakness or collapse

As shock develops, dogs become increasingly weak and may be unable to stand.

Rapid, weak pulse

Cardiovascular changes cause the heart rate to increase whilst pulse quality diminishes.

Click to read about the biological mechanisms

How this is usually investigated

GDV requires rapid assessment combining physical examination and imaging. The priority is stabilisation alongside diagnosis, as time is critical.

Physical examination

Purpose: To assess abdominal distension, cardiovascular status, and overall condition
Considerations: The characteristic appearance of a distended abdomen, non-productive retching, and signs of shock provide strong initial indicators.

Abdominal radiographs

Purpose: To confirm stomach position and identify the characteristic 'double bubble' or 'shelf' sign indicating volvulus
Considerations: X-rays can distinguish simple bloat from GDV, which requires different approaches. Right lateral views typically best demonstrate the rotation.

Blood tests

Purpose: To assess organ function, acid-base status, and lactate levels
Considerations: Help evaluate severity and guide supportive care. Lactate levels may provide prognostic information.

Electrocardiogram

Purpose: To monitor heart rhythm during stabilisation and treatment
Considerations: Cardiac arrhythmias commonly develop with GDV and may require specific treatment.

Options & trade-offs

GDV management combines emergency stabilisation with surgical correction. Various aspects of treatment address different components of the condition.

Emergency decompression

Releasing gas from the stomach via a tube through the mouth or needle through the body wall.

Trade-offs: Provides temporary relief of pressure whilst preparing for definitive treatment. Does not address the underlying rotation.

Surgical correction

Returning the stomach to normal position and assessing tissue viability.

Trade-offs: Essential for GDV. Allows direct assessment of stomach and spleen health. Non-viable tissue may require removal.

Gastropexy

Surgically attaching the stomach to the body wall to prevent future rotation.

Trade-offs: Significantly reduces recurrence risk. Typically performed during corrective surgery. Some breeds may benefit from preventive gastropexy.

Intensive supportive care

Intravenous fluids, pain management, cardiac monitoring, and management of complications.

Trade-offs: Critical for survival. The postoperative period carries risks including cardiac arrhythmias and complications from tissue damage.

Common misconceptions

Misconception:

"Only very large dogs get bloat"

Reality:

Whilst giant and large breeds are at highest risk, GDV can occur in medium-sized deep-chested dogs and occasionally in smaller breeds. Chest conformation matters as much as overall size.

Misconception:

"Bloat always happens right after eating"

Reality:

Whilst feeding may be a contributing factor, GDV can occur at any time. Episodes often happen in the evening but are not exclusively meal-related.

Misconception:

"A gastropexy completely prevents bloat"

Reality:

Gastropexy prevents the stomach from twisting but does not prevent simple bloat (dilatation without volvulus). It dramatically reduces the risk of the life-threatening volvulus component.

Owners of at-risk breeds might discuss preventive measures with their veterinary team, including whether preventive gastropexy might be appropriate for their individual dog. Being familiar with the early signs allows faster recognition. Some owners learn to recognise subtle changes in their dog's behaviour that precede episodes.

Last reviewed: 24 April 2026 · Dr Alastair Greenway MRCVS