If your dog has a swollen belly, keeps retching but brings nothing up, drools heavily and cannot settle, treat it as a life-threatening emergency and get to an emergency vet immediately. Bloat in dogs usually means gastric dilatation-volvulus (GDV), where the stomach fills with gas and can twist, and it can kill within hours without treatment. Ring the practice or out-of-hours clinic as you set off. Do not wait to see whether it passes and do not try to treat it at home.
This guide gives you a five-minute action list, a symptom table, an honest explanation of why owners cannot tell simple bloat from a twisted stomach, and what UK and international evidence says about risk, survival and prevention, including where the evidence disagrees.
What to do in the first five minutes
This list follows the PDSA’s advice to contact your vet immediately and “never wait to see if they improve”, and the Merck Veterinary Manual‘s advice to seek immediate veterinary care. The travel details are common-sense emergency practice rather than trial findings.
- Phone your vet practice now. If it is closed, use the out-of-hours number on its answerphone or website, or go to the nearest 24-hour emergency clinic. Say “I think my dog may have bloat or GDV.”
- Leave at once. If someone else can drive, they drive and you keep the dog calm. Do not stop to look things up or take photos.
- Do not give food. Ask the vet by phone before offering water or anything else. The veterinary sources reviewed give no owner first-aid steps beyond getting the dog to a clinic.
- Do not make the dog sick, press or rub the belly, walk the dog to “settle it”, or give any medicine (anti-gas products, anti-sickness tablets or painkillers) unless the vet tells you to.
- Tell the vet when the dog last ate or drank, when signs began, the breed and weight, any earlier surgery (especially removal of the spleen) and any medication.
If you are unsure, the PDSA’s advice is to ring the vet anyway, because acting early is better than waiting.
Bloat in dogs: symptoms to look for
Signs can begin suddenly, often within hours of a meal but not always. The stomach can trap gas without obvious outward swelling early on, so a normal-looking belly does not rule bloat out. The table brings together signs described by the Merck Veterinary Manual (professional version, full review August 2025), PetMD (updated February 2024) and the PDSA (August 2019).
| Stage | What you may notice | Comment |
|---|---|---|
| Early | Unproductive retching (trying to be sick but little or nothing comes up), sometimes with white foam | Merck lists “nonproductive retching” among the early signs. |
| Early | Heavy drooling | Merck: hypersalivation. The PDSA lists heavy drooling too. |
| Early | Restlessness, pacing, unable to settle | Often looks like anxiety or distress. |
| Early to advanced | Hard, swollen or tight belly | Merck says distension “may be noted”. PetMD notes swelling may not be visible early. |
| Early to advanced | Signs of belly pain: whining, a hunched or “praying” stance | Do not press the belly to check. |
| Advanced | Fast, shallow breathing or panting not explained by heat or exercise | Merck: the swollen stomach can press on the chest and limit breathing. |
| Advanced (shock) | Pale gums, weak pulse, fast heart rate, weakness, collapse | A critical stage. The PDSA describes progression to collapse and shock. |
The PDSA says GDV can develop “within minutes”. Merck lists clinical signs lasting more than 6 hours before examination among the factors linked to short-term death.
Bloat or GDV: why you cannot tell at home
Vets distinguish two conditions. In gastric dilatation (GD) the stomach is stretched with gas and fluid. In GDV the stretched stomach has also rotated, which traps the gas, can cut off blood flow and can cause shock. Merck states that X-rays tell the two apart.
| Gastric dilatation (GD) | Gastric dilatation-volvulus (GDV) | |
|---|---|---|
| What is happening | Stomach stretched by gas and fluid | Stretched stomach has also rotated |
| Can an owner tell them apart? | No. Signs overlap. Diagnosis needs a vet, usually with X-rays. | |
| Can a vet always tell quickly? | Usually, but not always. A 2025 German case report describes a 360-degree twist that was hard to separate from simple dilatation on first X-rays. It is a single case, so it shows that errors can happen, not how often. | |
| Safe plan for the owner | Treat every suspected case as GDV and go to the emergency clinic. | |
Some websites suggest mild signs, such as gurgling in a dog that is still eating, can be watched for a while. We found no veterinary study supporting that sorting, and every veterinary source reviewed advises urgent care whenever bloat is suspected.
Which dogs are most at risk? UK data first
GDV mainly affects large and giant, deep-chested dogs. The Kennel Club says large and giant breeds are more commonly affected. Two UK datasets give breed detail.
| Study | Population | What it found |
|---|---|---|
| O’Neill et al., J Small Anim Pract 2017 (PMID 28833166), RVC VetCompass with Vets Now | 77,088 dogs at 50 UK emergency clinics | 492 dogs (0.64%) had presumptive GDV. Compared with crossbreeds, the odds were 114.3 times higher for Great Danes, 84.4 times for Akitas and 82.9 times for Dogues de Bordeaux. Odds rose with age up to 12 years. This is an emergency-clinic population, so it overstates risk across all dogs. |
| Evans and Adams, J Small Anim Pract 2010 (PMID 20626784), Animal Health Trust | 2004 Kennel Club purebred dog health survey: 15,881 dogs that had died, 36,006 living dogs | GDV was the cause of death in 389 dogs, 2.5% of all deaths reported, at a median age of 7.92 years. Median age at first diagnosis was 5 years. The authors flagged 16 mostly large or giant breeds as at increased risk. Greatest morbidity: Grand Bleu de Gascogne, Bloodhound, Otterhound, Irish Setter and Weimaraner. |
| McCord et al., JAVMA 2026 (PMID 41349220), US Dog Aging Project | 47,444 US companion dogs; 170 owner-reported cases | Higher odds in purebreds, males, dogs over 40 kg (about 88 lb), dogs with a low body condition score, and Poodles and Poodle mixes (US data). |
Merck’s list of at-risk breeds adds German Shepherd Dogs, Gordon Setters, Saint Bernards, Standard Poodles and Basset Hounds. The studies mostly looked at large dogs, so they say little about small breeds.
Risk factors: what is supported and what conflicts
| Factor | What the studies found | Evidence strength and caveats |
|---|---|---|
| Large or giant, deep-chested breed | Consistent in UK and US data. | Strong. |
| Increasing age | Higher risk with age (Glickman 2000, PMID 10638316; O’Neill 2017). | Consistent. |
| Close relative with GDV | Higher risk (Glickman 2000, PMID 11128539). Merck calls genetics a “proven risk factor”. | Strong. Tell your breeder and vet. |
| Previous splenectomy | Odds 5.3 times higher in one study (Sartor 2013, PMID 23634682), confidence interval 1.1 to 26.8. | Moderate; wide uncertainty. |
| Male | Higher in Glickman 1997 (PMID 9138229), McCord 2026, and neutered males in O’Neill 2017 (1.3 times versus entire females). Merck reports no sex predisposition. | Conflicting. |
| Thin or underweight | Higher risk in Glickman 1997 and McCord 2026. | Moderate. |
| Eating fast | Higher risk in Glickman 1997 and 2000. | Moderate; owner-reported. |
| Large volume per meal | Higher risk regardless of meals per day (Raghavan 2004, PMID 15131099). | Moderate; one study. |
| One meal a day | Higher risk in Glickman 1997. McCord 2026 found no link with meals per day. | Conflicting. Splitting meals is low-risk but its protective effect is not settled. |
| Raised food bowl | Glickman 2000 attributed about 20% (large breeds) and 52% (giant breeds) of cases to a raised bowl. The PDSA now advises feeding from the floor and Merck advises avoiding elevated bowls. | Weak to moderate; one cohort, not replicated in the sources reviewed. |
| Fat or oil among first four ingredients of dry food | 2.4-fold higher risk (Raghavan 2006, PMID 16397192); McCord 2026 found no link with diet type. | Weak and unconfirmed. |
| Nervous or fearful temperament | Linked in Glickman 1997; McCord 2026 found no link with anxiety. | Conflicting. |
| Exercise or travel soon after eating | Advised against by the PDSA and Merck. We found no controlled study in the sources reviewed that tests it. | Expert advice only. |
Size, breed, age and family history are the factors you can trust. Feeding rules are sensible and low-risk but unproven, and none of them removes the risk or justifies waiting if signs appear.
Survival: why the figures differ
The PDSA says around 1 in 3 dogs that develop GDV die, even with treatment. A UK study reported about 80% survival in surgical cases. Both are accurate because they count different dogs.
| Source | Figure | What was counted |
|---|---|---|
| PDSA (2019) | Around 1 in 3 die, even with treatment | Dogs developing GDV; no study cited in the document. |
| O’Neill 2017 (UK, 50 Vets Now clinics) | 49.7% of dogs presented alive survived to discharge; 79.3% of surgical cases | Roughly half of owners chose surgery. |
| Glickman 2000 | 28.6% (30 of 105) died | US prospective cohort of large and giant breeds. |
| Sharp 2020 (PMID 32077192, Tufts, US) | 64.1% survived of 498 dogs; 83.5% when dogs euthanised before surgery were excluded | 116 dogs were euthanised on arrival without surgery; the authors say this accounted for most deaths. |
| Merck (Aug 2025) | 20%, 20 to 45% and 25 to 30% in treated animals | Different figures appear in different sections of the same page. |
In dogs that reach surgery, most survive. Many deaths in these datasets happen before surgery because of euthanasia, and an Australian study found uninsured dogs about five times more likely to be euthanised before surgery than insured ones (Anderson 2021, PMID 33896404; only 69 dogs had known insurance status, so the estimate is imprecise). The PDSA advises insuring your dog early and talking openly with your vet about costs and options. If cost worries you, say so on the phone, and do not delay the journey to decide.
What happens at the clinic
Merck describes the immediate goals as restoring circulating blood volume and decompressing the stomach, using IV fluids, oxygen and a stomach tube or needle. X-rays help confirm GDV. Surgery then repositions the stomach, checks for dead tissue and usually includes a gastropexy, which stitches the stomach to the body wall. Merck notes decompression without surgery has an “extremely high recurrence rate”.
Preventive gastropexy
Merck says a gastropexy “has not been shown to prevent bloat (gastric dilation)” but “should prevent the life-threatening volvulus”. Evidence is retrospective:
- 61 dogs followed for a median of 717 days: no GDV after incisional gastropexy, though 3 of 27 preventive cases (11.1%) had recurrent dilatation alone (Benitez 2013, PMID 23535748).
- 766 dogs: only 61 were elective; 705 were done during emergency surgery. Direct complications at the gastropexy site occurred in 3 dogs (0.4%) (de la Vega 2023, PMID 37908004).
- After GDV surgery with ventral midline gastropexy, 6.4% of 203 dogs later showed signs of dilatation or GDV (Ullmann 2016, PMID 26459100).
We found no randomised trial of preventive gastropexy. It is surgery, so discuss breed risk, family history, age and cost with your vet.
Myths and facts
| Claim | Verdict |
|---|---|
| “A dog with bloat will always be sick.” | No. The classic sign is retching with little or nothing coming up. |
| “No swollen belly, so it isn’t bloat.” | Not safe to assume. Swelling may not be visible early. |
| “I can treat it at home.” | No. PetMD states there are no home remedies, and treatment in Merck is hospital-based. |
| “It is always fatal.” | No. About 80% of dogs that reach surgery survive in UK and other series. But it is fatal without treatment. |
| “Only Great Danes get it.” | No. Akitas, Dogues de Bordeaux, Weimaraners, German Shepherds, Poodles and others appear in the data. |
| “A raised bowl prevents bloat.” | Not supported. The one study that tested it linked raised bowls to higher risk. |
If your dog is at higher risk: a checklist for today
- Save your practice’s out-of-hours number and your nearest 24-hour emergency clinic’s address in your phone.
- Ask your vet whether your dog’s breed and family history justify a preventive gastropexy.
- Use low-risk routines: smaller portions, a slower pace for fast eaters, and a quiet rest after meals.
- Tell any vet if your dog has had its spleen removed.
- Tell your breeder and vet if a relative has had GDV.
Frequently asked questions
What are the first signs of bloat in a dog?
Unproductive retching, heavy drooling and restlessness, sometimes with a swollen belly. Early swelling may not show, so ring a vet straight away.
How fast can bloat kill a dog?
There is no fixed time. The PDSA says GDV can develop within minutes, and Merck links signs lasting more than 6 hours before examination to higher short-term death risk. Treat every suspected case as an emergency.
Can I tell bloat from GDV myself?
No. Diagnosis needs a vet and usually X-rays. Treat every suspected case as GDV.
What should I not do?
Do not induce vomiting, press the belly, give food or medicine, or delay the journey.
Do dogs survive bloat?
Many do. About 80% of surgical cases survived in a UK emergency study, but figures vary with how many dogs are euthanised before surgery.
Does a raised bowl help?
The evidence points the other way (Glickman 2000), and the PDSA advises feeding from the floor.
Sources
- Merck Veterinary Manual (professional version). Gastric Dilation and Volvulus in Small Animals. Winkler KP; peer reviewed by Carnevale J. Full review August 2025. merckvetmanual.com
- PDSA. GDV (Gastric Dilatation Volvulus). PetWise Pet Health Hub, August 2019. pdsa.org.uk
- PetMD. Bloat in Dogs. Updated February 29, 2024. petmd.com
- The Kennel Club (UK). The Kennel Club hosts free bloat webinar for dog owners. 29 October 2024. royalkennelclub.com
- O’Neill DG, Case J, Boag AK, et al. Gastric dilation-volvulus in dogs attending UK emergency-care veterinary practices: prevalence, risk factors and survival. J Small Anim Pract. 2017;58(11):629-638. PMID 28833166. DOI 10.1111/jsap.12723.
- Evans KM, Adams VJ. Mortality and morbidity due to gastric dilatation-volvulus syndrome in pedigree dogs in the UK. J Small Anim Pract. 2010;51(7):376-381. PMID 20626784. DOI 10.1111/j.1748-5827.2010.00949.x.
- Glickman LT, Glickman NW, Schellenberg DB, Raghavan M, Lee TL. Incidence of and breed-related risk factors for gastric dilatation-volvulus in dogs. J Am Vet Med Assoc. 2000;216(1):40-45. PMID 10638316. DOI 10.2460/javma.2000.216.40.
- Glickman LT, Glickman NW, Schellenberg DB, Raghavan M, Lee T. Non-dietary risk factors for gastric dilatation-volvulus in large and giant breed dogs. J Am Vet Med Assoc. 2000;217(10):1492-1499. PMID 11128539. DOI 10.2460/javma.2000.217.1492.
- Glickman LT, Glickman NW, Schellenberg DB, Simpson K, Lantz GC. Multiple risk factors for the gastric dilatation-volvulus syndrome in dogs: a practitioner/owner case-control study. J Am Anim Hosp Assoc. 1997;33(3):197-204. PMID 9138229. DOI 10.5326/15473317-33-3-197.
- Raghavan M, Glickman N, McCabe G, Lantz G, Glickman LT. Diet-related risk factors for gastric dilatation-volvulus in dogs of high-risk breeds. J Am Anim Hosp Assoc. 2004;40(3):192-203. PMID 15131099. DOI 10.5326/0400192.
- Raghavan M, Glickman NW, Glickman LT. The effect of ingredients in dry dog foods on the risk of gastric dilatation-volvulus in dogs. J Am Anim Hosp Assoc. 2006;42(1):28-36. PMID 16397192. DOI 10.5326/0420028.
- McCord MA, O’Brien J, Ryave J, et al. Gastric dilatation-volvulus is associated with Poodle breeds, increased body size, and male sex, but not primary diet type or anxiety in the Dog Aging Project cohort. J Am Vet Med Assoc. 2026;264(4). PMID 41349220. DOI 10.2460/javma.25.09.0609.
- Sharp CR, Rozanski EA, Finn E, Borrego EJ. The pattern of mortality in dogs with gastric dilatation and volvulus. J Vet Emerg Crit Care. 2020;30(2):232-238. PMID 32077192. DOI 10.1111/vec.12932.
- Anderson S, Stevenson MA, Boller M. Pet health insurance reduces the likelihood of pre-surgical euthanasia of dogs with gastric dilatation-volvulus in the emergency room of an Australian referral hospital. N Z Vet J. 2021;69(5):267-273. PMID 33896404. DOI 10.1080/00480169.2021.1920512.
- Sartor AJ, Bentley AM, Brown DC. Association between previous splenectomy and gastric dilatation-volvulus in dogs: 453 cases (2004-2009). J Am Vet Med Assoc. 2013;242(10):1381-1384. PMID 23634682. DOI 10.2460/javma.242.10.1381.
- Benitez ME, Schmiedt CW, Radlinsky MG, Cornell KK. Efficacy of incisional gastropexy for prevention of GDV in dogs. J Am Anim Hosp Assoc. 2013;49(3):185-189. PMID 23535748. DOI 10.5326/JAAHA-MS-5849.
- de la Vega M, Ralphs SC. Outcomes and complications of prophylactic incisional gastropexy in 766 dogs (2009-2019). BMC Res Notes. 2023;16(1):300. PMID 37908004. DOI 10.1186/s13104-023-06595-6.
- Ullmann B, Seehaus N, Hungerbuhler S, Meyer-Lindenberg A. Gastric dilatation volvulus: a retrospective study of 203 dogs with ventral midline gastropexy. J Small Anim Pract. 2016;57(1):18-22. PMID 26459100. DOI 10.1111/jsap.12406.
- Lang A, Bohme S, Kuhn V, Rayher S, Lautersack O. Diagnostic challenges of a 360 degree gastric dilatation volvulus in a dog: a case report [German]. Tierarztl Prax Ausg K Kleintiere Heimtiere. 2025;53(3):167-172. PMID 40513607. DOI 10.1055/a-2589-3449.
This article is general information, not veterinary advice, and cannot diagnose your dog. If your dog shows any sign described here, contact an emergency vet immediately.