If you own a Great Dane, a Standard Poodle, a German Shepherd, a Weimaraner, a Saint Bernard, a Gordon Setter, an Irish Setter, a Basset Hound, a Boxer, or any other deep-chested large breed, you have probably heard the term "bloat." It is the colloquial name for gastric dilatation and volvulus (GDV), and it is one of the most time-critical emergencies in veterinary medicine. The mortality rate for dogs that present to the clinic within the first hour is roughly 15 to 25 percent. The mortality rate for dogs that present more than four hours after the onset of signs is roughly 50 to 70 percent. The mortality rate for dogs that present after the stomach has ruptured or the spleen has necrosed is essentially 100 percent. The difference between these outcomes is almost entirely a function of how quickly the owner recognised the problem and got the dog to a surgical clinic.
This article is the practical emergency view of GDV. We will go through the pathophysiology, the breeds at risk, the recognition, the diagnostic steps, the surgical correction, the post-op care, the prognosis, the preventive gastropexy, and the four mistakes I see in the failed cases.
What GDV actually is
GDV is two related but distinct problems that occur in sequence.
Gastric dilatation is the abnormal distension of the stomach with gas, fluid, and ingested food. The stomach swells like a balloon. The swelling is caused by a combination of swallowed air (aerophagia), fermentation of stomach contents, and obstruction of the normal outflow through the pylorus or the duodenum. The distended stomach presses on the diaphragm, the caudal vena cava, and the other abdominal organs. The dog cannot belch, cannot vomit effectively, and cannot pass the gas downward.
Gastric volvulus is the rotation of the distended stomach around its mesenteric axis, typically 180 to 360 degrees. Once the stomach has rotated, the openings (the gastroesophageal junction at the top, the pylorus at the bottom) are twisted shut. The gas and fluid inside cannot escape. The blood supply to the stomach is compromised, and the stomach wall begins to die. The spleen, which is attached to the stomach via the gastrosplenic ligament, often rotates with the stomach, and the splenic blood supply is also compromised. The pressure on the caudal vena cava reduces venous return to the heart, dropping cardiac output and producing shock.
The two events are not the same, and they are not always both present. A dog can have gastric dilatation without volvulus (often called "simple bloat" or "food bloat"), which is less severe and may resolve with medical management. A dog with volvulus is a true surgical emergency. The clinical signs overlap, and the distinction cannot be made without imaging, so the practical approach is to assume volvulus until proven otherwise.
The breeds most at risk
GDV is a disease of large, deep-chested breeds. The classic list:
- Great Dane (lifetime risk approximately 40%, the highest of any breed)
- Standard Poodle
- German Shepherd
- Weimaraner
- Saint Bernard
- Gordon Setter
- Irish Setter
- Basset Hound
- Boxer
- Doberman Pinscher
- Old English Sheepdog
- Standard Schnauzer
- Akita
- Bloodhound
- Newfoundland
Smaller breeds can also bloat, but the incidence is much lower. The deep chest conformation is the main risk factor because it allows the stomach more room to rotate. Other risk factors include eating one large meal per day, eating rapidly, eating from a raised bowl, exercising vigorously after eating, being underweight, and being older (the risk increases with age). First-degree relatives of dogs that have bloated are at higher risk, suggesting a genetic component to the conformation.
Recognising the signs
Early signs (first 30 to 60 minutes):
- Restlessness, pacing, inability to settle
- Repeated attempts to vomit that produce nothing or produce only white foam
- Distension of the abdomen, especially behind the ribs on the left side
- Drooling
- The dog looks at the abdomen, "admiring" it
- Pain when the abdomen is palpated
Moderate signs (1 to 3 hours):
- Obvious abdominal distension, tympanic (drum-like) on percussion
- Weakness, reluctance to stand
- Rapid heart rate
- Pale gums
- Dehydration
Late signs (more than 3 hours):
- Collapse
- Coma
- Pale or blue gums
- Very rapid or very slow heart rate
- Bloody vomiting (indicates stomach wall necrosis)
- Death
The owner who recognises the early signs and gets the dog to a clinic within the first hour has a dog that almost always survives surgery. The owner who waits "to see if it gets better" has a dog with a much worse prognosis.
The "trying to vomit but producing nothing" is the most characteristic sign. A dog with simple gastric dilatation (no volvulus) may be able to vomit up some food and feel better. A dog with volvulus cannot vomit because the gastroesophageal junction is twisted shut. The non-productive retching is the classic sign of true GDV.
What to do at home (and what not to do)
There is very little the owner can do at home for true GDV. This is a surgical emergency. The dog needs to be at a clinic with surgical capability as soon as possible.
What to do:
- Get the dog to a car, to a veterinary clinic, or to an emergency clinic immediately.
- Call the clinic on the way to let them know you are coming with a suspected GDV, so they can prepare.
- Keep the dog calm and still. Avoid rough handling.
- Do not offer food or water.
What not to do:
- Do not attempt to "burp" the dog or pass a stomach tube at home. This is a veterinary procedure that requires sedation and trained hands.
- Do not give the dog anything to eat or drink.
- Do not wait to see if it improves.
- Do not drive to a clinic that does not have surgical capability. Call ahead to confirm the clinic has a surgeon on duty or can stabilise and refer.
The diagnostic steps at the clinic
At the clinic, the team will:
- Physical exam. Palpate the abdomen, check the heart rate, check the gum colour, check the capillary refill time. The classic finding is a tympanic, distended abdomen with a rapid heart rate and signs of shock.
- Lateral abdominal X-ray. This is the definitive diagnostic. The X-ray will show the distended stomach, and if there is volvulus, the classic "double bubble" or "smurf hat" sign, with the pylorus displaced dorsally and to the right of the fundus. The X-ray also shows whether the spleen is involved and whether there is free gas in the abdomen (indicating stomach rupture).
- Bloodwork. A quick in-house panel for PCV, total protein, lactate, and electrolytes. A lactate above 6 mmol/L is a poor prognostic indicator, suggesting significant tissue hypoperfusion or stomach wall necrosis. Electrolytes often show hypokalemia and metabolic acidosis.
- Stabilisation. While the diagnostic is being confirmed, the team will place a large-bore IV catheter, start IV fluids (usually crystalloids at shock dose), give pain relief (usually an opioid), and prepare for surgery.
The surgical correction
Surgery for GDV has three parts:
- Decompression. The surgeon passes a stomach tube (if possible) or uses a large-bore needle to release the gas from the distended stomach. This is done under anesthesia, immediately after induction. Decompression before surgery dramatically reduces the anaesthetic risk.
- Derotation. The surgeon rotates the stomach back to its normal position. The direction of rotation is usually clockwise when viewed from the surgeon's perspective (i.e. the pylorus was displaced to the right and dorsally, and is rotated back to the left and ventrally). The surgeon assesses the viability of the stomach wall and the spleen. Any necrotic tissue is resected. In severe cases, partial gastrectomy or splenectomy is required.
- Gastropexy. The surgeon tacks the stomach wall to the abdominal wall (usually on the right side) using sutures. This prevents future rotation. A properly performed gastropexy reduces the recurrence rate of GDV from over 80% to under 5%. Most surgeons perform a gastropexy on every GDV patient, even if the stomach wall is healthy.
The surgery typically takes 45 to 90 minutes. The post-operative hospitalisation is 24 to 72 hours, with IV fluids, pain management, anti-nausea medication, and monitoring for complications.
The post-operative complications
The most common complications are:
- Cardiac arrhythmias. Ventricular premature contractions (VPCs) are common in the first 24 to 48 hours. They are caused by the myocardial sensitivity that develops during the shock state. Most resolve with correction of the electrolyte imbalances and supportive care.
- Aspiration pneumonia. If the dog regurgitated or vomited during the event, aspiration of stomach contents into the lungs can produce pneumonia. Antibiotics and supportive care are required.
- Peritonitis. If the stomach wall was necrotic and resection was required, there is a risk of leakage at the surgical site. This is a serious complication.
- Sepsis. If bacteria from the stomach translocated into the bloodstream during the event, sepsis can develop in the first 24 to 48 hours.
- Recurrence. Without gastropexy, the recurrence rate is over 80%. With gastropexy, it is under 5%.
The prognosis
For dogs that present within the first hour, the survival rate is 80 to 90 percent. For dogs that present between 1 and 4 hours, the survival rate is 60 to 80 percent. For dogs that present after 4 hours, the survival rate is 30 to 50 percent. For dogs that present with stomach rupture, gastric necrosis requiring major resection, or septic peritonitis, the survival rate is below 30 percent.
The lactate at presentation is a useful prognostic indicator. Dogs with a lactate below 4 mmol/L have an excellent prognosis. Dogs with a lactate above 6 mmol/L have a guarded prognosis. Dogs with a lactate above 9 mmol/L have a poor prognosis.
Preventive gastropexy
For at-risk breeds, a prophylactic gastropexy is a reasonable consideration. The procedure can be done laparoscopically, often at the same time as a spay or neuter, and the recovery is straightforward. The gastropexy does not prevent gastric dilatation (the stomach can still fill with gas), but it prevents the rotation, which is the life-threatening part. A gastropexyed dog can still bloat medically, but the bloat will not become a surgical emergency.
Many breeders and breed clubs recommend gastropexy for at-risk breeds, particularly Great Danes, Standard Poodles, and Weimaraners. The procedure does not eliminate the risk, but it dramatically reduces the mortality. The cost is roughly $500 to $1,500 depending on the clinic and whether it is done laparoscopically or as an open procedure.
The four mistakes
Mistake 1: Waiting to see if the dog improves. This is the most common and the most fatal mistake. The non-productive retching, the distension, the restlessness — these signs do not improve on their own. They progress to shock, gastric necrosis, and death. The owner who gets the dog to a surgeon within the first hour saves the dog. The owner who waits loses the dog.
Mistake 2: Driving to a clinic that does not have a surgeon. Not every veterinary clinic has a surgeon on duty or the equipment to perform a gastropexy. The owner who drives 45 minutes to their regular clinic, only to be referred to the emergency clinic another 30 minutes away, has lost an hour and a half. Call ahead. Go to a clinic that can perform the surgery now.
Mistake 3: Feeding the dog or offering water before surgery. A distended, rotated stomach can easily regurgitate its contents into the lungs, causing fatal aspiration pneumonia. Do not offer food or water to a bloating dog. The dog will be intubated for surgery with a protected airway, but anything consumed before induction is a risk.
Mistake 4: Declining the gastropexy during surgery. A dog that has bloated once has an 80% chance of bloating again without gastropexy. The surgeon will usually recommend gastropexy at the time of the corrective surgery. The owner who declines because of cost, or who thinks "we'll deal with it if it happens again," is gambling with an 80% odds. The gastropexy is the part of the surgery that prevents the next crisis.
Closing the loop
GDV is a disease of time. The pathophysiology is fixed: the stomach fills with gas, rotates, and compromises its own blood supply. The dog goes into shock. The clock starts. The owner who recognises the early signs, calls ahead, and arrives at a surgical clinic within the first hour, has a dog that almost always survives. The owner who waits, drives to the wrong clinic, or declines the gastropexy, has a dog that probably will not. The four mistakes above are the only ones that really matter. Everything else is detail.
