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 go to the nearest emergency veterinary clinic immediately. “Bloat” in dogs usually means gastric dilatation-volvulus (GDV), in which the stomach fills with gas and can twist, and it can become fatal within hours without treatment. Phone the clinic while you are on your way. Do not wait to see whether the signs pass, and do not try to treat it at home.
Below you will find a five-minute action checklist, a symptom table, an honest explanation of why owners cannot tell simple bloat from a twisted stomach, and what the evidence says about risk, survival and prevention, including where the evidence disagrees.
What to do in the first five minutes
Use this list if you suspect bloat now. It is written from the Merck Veterinary Manual’s advice to “seek immediate veterinary care if clinical signs are apparent” and the PDSA’s “never wait to see if they improve” (sources below). The details on how to travel are common-sense emergency practice, not findings from a trial.
- Call an emergency veterinary clinic now and say “I think my dog may have bloat or GDV.” Ask them to prepare. If your regular clinic is closed, use your local 24-hour emergency hospital.
- Leave straight away. If someone else can drive, let them drive while you keep the dog calm. Do not stop to finish a task, take photos or search for more information.
- Do not give food. Ask the clinic by phone before offering anything else, including water. The veterinary sources reviewed give no owner first-aid steps beyond getting the dog to a clinic.
- Do not make the dog vomit, press or massage the belly, walk the dog to “settle it,” or give any medicine (including anti-gas products, anti-nausea tablets or painkillers) unless the clinic’s veterinarian tells you to.
- Tell the clinic when the dog last ate or drank, when signs started, the dog’s breed and weight, any previous surgery (especially spleen surgery), and any medication.
If you are unsure whether it is bloat, the PDSA advises phoning the vet anyway because acting early is better than waiting. A call costs little and a delay can cost a life.
Dog bloat symptoms: what you may see
Signs can start suddenly, often (but not always) within hours of a meal. The stomach can also trap gas without any obvious outward swelling early on, so the absence of a big belly does not rule bloat out. The table groups signs reported 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 or dry heaving, sometimes with a little white foam | Merck lists “nonproductive retching” among the early signs. The dog tries to vomit but little or nothing comes up. |
| Early | Heavy drooling | Merck: hypersalivation. |
| Early | Restlessness, pacing, unable to lie down or settle | Often described as anxiety or distress. |
| Early to advanced | Swollen or tight belly | Merck says distension “may be noted” and may be acute or progressive. PetMD notes swelling may not be visible early. |
| Early to advanced | Signs of belly pain: whining, a hunched or “praying” stance, flinching if the belly is touched | Do not press the belly to check. PetMD and Chewy describe the “praying” stance. |
| Advanced | Fast, shallow breathing or panting that is not explained by heat or exercise | Merck: the swollen stomach can compress the chest and limit breathing. |
| Advanced (shock) | Pale gums, weak pulse, rapid heart rate, weakness, collapse | Merck lists weak pulses, tachycardia, prolonged capillary refill time, pale mucous membranes and dyspnea. This is a critical stage. |
The PDSA describes GDV as developing “within minutes” in some dogs. Merck lists clinical signs lasting more than 6 hours before examination among the factors associated with short-term death.
Bloat vs. GDV: why you cannot tell the difference at home
Veterinarians separate two conditions. In gastric dilatation (GD), the stomach fills with gas and fluid. In gastric dilatation-volvulus (GDV), the stomach also rotates on its axis, which traps the gas, can block blood flow and can cause shock. The Merck Veterinary Manual says X-rays separate the two, with “double bubble” and “reverse C” signs pointing to GDV.
| 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. The signs overlap, and the Ontario SPCA’s veterinary author states you cannot tell by looking. Diagnosis needs a veterinarian and usually X-rays. | |
| Can a veterinarian always tell quickly? | Usually, but not always. A 2025 German case report describes a 360-degree volvulus that was hard to separate from simple dilatation on first X-rays; it is a single case, so it shows that errors are possible, not how often they happen. | |
| Treatment | Hospital treatment is still needed | Emergency stabilisation, stomach decompression and surgery (Merck) |
| Safe plan for the owner | Treat every suspected case as GDV and go to the emergency clinic. | |
Some pages online suggest that mild signs, such as gurgling or burping in a dog that is still eating, can be watched at home for a while. We found no veterinary study that supports sorting dogs this way, and the other sources reviewed (Merck, PDSA, PetMD, the Ontario SPCA) advise urgent veterinary care whenever bloat is suspected. A dog with these signs plus a swollen belly or non-productive retching is not a “wait and see” dog.
Which dogs are most at risk?
GDV is mainly a disease of large and giant, deep-chested dogs, but the numbers differ by study and breed list.
| Study | Population | What it found |
|---|---|---|
| Glickman et al., JAVMA 2000 (PMID 10638316) | 1,914 dogs of 11 large and giant breeds followed prospectively (US) | Incidence 23 per 1,000 dog-years in large breeds (23 to 45 kg, 50 to 99 lb) and 26 per 1,000 dog-years in giant breeds (over 45 kg, over 99 lb). Cumulative incidence 5.7%. Of 105 dogs that developed GDV, 30 (28.6%) died. |
| O’Neill et al., J Small Anim Pract 2017 (PMID 28833166) | 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 for dogs in general. |
| McCord et al., JAVMA 2026 (PMID 41349220) | 47,444 US companion dogs (Dog Aging Project); 170 owner-reported cases | Lifetime prevalence 0.23%. Higher odds in purebreds, males, dogs over 40 kg (about 88 lb), dogs with a low body condition score, and Poodles and Poodle mixes. Poodles were the breed with the highest occurrence, which the authors call novel. |
| Ward et al., Prev Vet Med 2003 (PMID 12941556) | Model for five breeds | Estimated lifetime risk of GDV from 3.9% (Rottweiler) to 36.7% (Great Dane). These are modelled estimates built on older data, not measurements. |
Merck’s list of at-risk breeds includes Great Danes, German Shepherd Dogs, Irish and Gordon Setters, Weimaraners, Saint Bernards, Standard Poodles and Basset Hounds. A mixed-breed dog is not immune: size and chest shape matter, and the studies above mostly looked at large dogs. Small dogs are rarely covered by the large studies, so these numbers say little about them.
Risk factors: what the evidence supports and where it disagrees
Many “bloat prevention rules” repeated online come from a few studies, and newer data do not always agree with older data. This table shows the strength of the evidence rather than a single list of rules.
| Factor | What the studies found | Evidence strength and caveats |
|---|---|---|
| Large or giant, deep-chested breed | Consistently associated with GDV in US and UK data (see table above). | Strong and consistent. |
| Increasing age | Higher risk with age (Glickman 2000; O’Neill 2017). | Consistent in the studies reviewed. |
| First-degree relative with GDV | Higher risk (Glickman 2000, PMID 11128539). Merck calls genetics a “proven risk factor.” | Strong. It is a reason to tell your breeder and vet. |
| Previous spleen removal (splenectomy) | Odds 5.3 times higher in one case-control study of 151 cases (Sartor 2013, PMID 23634682). | Moderate. The confidence interval is wide (1.1 to 26.8). |
| Male sex | Higher risk in a case-control study (Glickman 1997, PMID 9138229) and the Dog Aging Project (2026). Merck reports no sex predisposition. | Conflicting between sources. |
| Thin or underweight | Higher risk in Glickman 1997 and McCord 2026. | Moderate. Two studies agree, in different decades. |
| Eating quickly | Higher risk in Glickman 1997 and 2000. | Moderate. Based on owner-reported behaviour. |
| Large volume per meal | Higher risk regardless of meals per day, highest for a large volume fed once daily (Raghavan 2004, PMID 15131099). | Moderate. One nested case-control study. |
| One meal a day | Higher risk in Glickman 1997. McCord 2026 found no association with number of meals per day. | Conflicting. Splitting meals is low-risk advice, 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. Merck advises avoiding elevated bowls without citing evidence, and the PDSA advises floor feeding. | Weak to moderate. One study identified the link. We did not find a replication in the sources reviewed, and the study’s results are statistical associations in dogs recruited at dog shows. |
| Fat or oil in the first four label ingredients of dry food | 2.4-fold higher risk in 85 cases (Raghavan 2006, PMID 16397192). Soy and cereal ingredients were not associated. McCord 2026 found no association with primary diet type. | Weak and unconfirmed. Not a reason to change a food on its own. |
| Fearful or stressed temperament | Fearful temperament and stress as a trigger in Glickman 1997. McCord 2026 found no association with anxiety. | Conflicting. Owner-reported temperament is hard to measure. |
| Exercise soon after eating | Recommended by Merck and PDSA as owner advice. We did not find a controlled study in the sources reviewed that tests it. | Expert advice, not shown by trial data. |
| Spay or neuter status | No association in McCord 2026. Neutered males had 1.3 times the odds compared with entire females in O’Neill 2017. | Mixed. |
The practical reading is that size, breed, age and family history are the factors that can be trusted. Most feeding rules (smaller meals, slower eating, a rest after meals) are sensible and low-risk, but they are not proven to prevent GDV, and no feeding routine removes the risk. Do not let a good routine make you wait if signs appear.
Survival: why the numbers you read online do not match
Some pages say a third of dogs die, others say 80% survive. Both can be true because they count different dogs.
| Source | Figure | What was counted |
|---|---|---|
| Glickman 2000 (PMID 10638316) | 28.6% (30 of 105) died | Dogs in a prospective cohort that developed GDV. |
| Glickman 1998 (PMID 9590454) | 24.3% died or were euthanised in the first 7 days (136 dogs) | Dogs treated for GDV. Dogs that were depressed or comatose on arrival were 3 and 36 times more likely to die than alert dogs; dogs with stomach-wall necrosis were 11 times more likely to die. |
| Sharp et al., Tufts, 2020 (PMID 32077192) | 64.1% of 498 dogs survived to discharge; 83.5% when dogs euthanised before surgery were excluded | In this hospital, 116 dogs were euthanised on arrival without surgery. The authors conclude that pre-operative euthanasia accounted for most deaths. |
| O’Neill 2017 (PMID 28833166) | 49.7% of live-presented dogs survived overall; 79.3% of surgical cases survived to discharge | UK emergency practices. Roughly half the owners chose surgery. |
| Song et al., Aust Vet J 2020 (PMID 32253749) | 81.7% (general surgeons) and 88.7% (specialists) survival after surgery; 276 of 736 dogs were humanely killed | Two Sydney referral hospitals. Mortality odds were 2.53 times higher when more than 3 hours passed between presentation and completed surgery. |
| Merck Veterinary Manual (Aug 2025) | 20%, 20 to 45% and 25 to 30% in treated animals | The page gives different figures in different sections, so they should not be read as one estimate. |
Three conclusions can be drawn. First, in dogs that reach surgery, most survive (roughly 80% in several series). Second, many deaths in these datasets happen before surgery because of euthanasia, and one Australian study found that uninsured dogs were about 5 times more likely to be euthanised before surgery than insured dogs (Anderson 2021, PMID 33896404; only 69 dogs had known insurance status, so the estimate is imprecise). Third, speed matters: sicker dogs on arrival and longer delays are linked to worse outcomes. If cost worries you, say so when you phone the clinic and ask what options exist; do not delay the journey to decide.
What happens at the clinic
According to the Merck Veterinary Manual, the immediate goals are restoring circulating blood volume and decompressing the stomach. Vets typically place large-bore IV catheters, give fluids and oxygen, and release the gas with a stomach tube or a needle through the belly wall. X-rays help confirm GDV. Surgery then repositions the stomach, checks for dead tissue and usually includes a gastropexy, in which the stomach is stitched to the body wall so it cannot twist again. Decompression without surgery has an “extremely high recurrence rate,” according to Merck.
Preventive gastropexy: what the evidence says
A gastropexy is the one prevention method with a mechanism and supporting data. Merck states that a gastropexy “has not been shown to prevent bloat (gastric dilation)” but “should prevent the life-threatening volvulus.” It can sometimes be done during a spay or neuter, and your veterinarian can advise whether your dog’s breed and family history justify it.
- In 61 dogs followed a median of 717 days, none developed GDV after incisional gastropexy, though 3 of 27 dogs with preventive gastropexy (11.1%) had recurrent dilatation alone (Benitez 2013, PMID 23535748).
- Of 766 dogs with incisional gastropexy, only 61 were done electively at spay or neuter; 705 were done during emergency surgery. Direct complications of the gastropexy site occurred in 3 dogs (0.4%) (de la Vega 2023, PMID 37908004).
- After treatment for GDV with a ventral midline gastropexy, 6.4% of 203 dogs later had signs of dilatation or GDV (Ullmann 2016, PMID 26459100).
- In older observational data, median survival was 547 days with a gastropexy and 188 days without after GDV (Glickman 1998), but the groups were not randomised.
These are retrospective or observational studies. We did not find a randomised trial of preventive gastropexy in the sources reviewed. A gastropexy is also surgery, so the decision belongs to you and your veterinarian, weighing breed risk, family history, age and cost.
Myths and facts
| Claim | Verdict |
|---|---|
| “A dog with bloat will always vomit.” | No. The classic sign is unproductive retching, where little or nothing comes up. |
| “No swollen belly means it isn’t bloat.” | Not safe to assume. PetMD notes swelling may not be visible early, and Merck says distension “may” be present. |
| “I can treat it at home with walking, massage or anti-gas medicine.” | No. PetMD states there are no home remedies, and the treatment in Merck is hospital-based. Delay is linked to worse outcomes. |
| “Bloat is always a death sentence.” | No. About 80% of dogs that reach surgery survive in several series (O’Neill 2017; Song 2020; Sharp 2020 when pre-operative euthanasia is excluded). But it kills quickly without treatment. |
| “It only affects Great Danes.” | No. Great Danes are at very high risk, but Poodles, Akitas, Weimaraners, German Shepherds and other large breeds appear in the data. |
| “A raised bowl prevents bloat.” | Not supported. The one study that tested it found higher risk with raised bowls, and Merck and the PDSA advise against them. The evidence is limited, but it does not support raising the bowl. |
| “A preventive gastropexy stops bloat.” | Partly. It is intended to prevent the stomach from twisting (volvulus), not the gas build-up itself. |
If your dog is at higher risk: a practical checklist for today
- Save the number and address of your nearest 24-hour emergency clinic in your phone and tell everyone in the household.
- Ask your veterinarian whether your dog’s breed, size and family history justify a preventive gastropexy, and when it could be done.
- Choose feeding routines that are low-risk even if not proven: smaller portions, a slower pace for fast eaters, and a quiet rest after meals. Ask your vet how to apply them to your dog.
- Tell your vet and any surgeon if your dog has had its spleen removed.
- If a relative of your dog (parent, sibling, offspring) has had GDV, tell your vet and your breeder.
- Know the signs above, and act on them without waiting.
Frequently asked questions
What are the first signs of bloat in a dog?
The early signs are unproductive retching, heavy drooling and restlessness, and sometimes a swollen belly. Because early swelling may not be visible, retching without vomiting plus restlessness is enough to call an emergency clinic.
How fast does bloat kill a dog?
No single timeline applies. The PDSA says GDV can develop within minutes, and Merck links signs lasting more than 6 hours before examination with higher short-term death risk. Treat any suspected case as an emergency.
Can a dog with bloat poop or pass gas?
Possibly. Chewy lists no stool, small-volume stool or diarrhea among the signs, so the bowels cannot be used to rule bloat out. Judge by the other signs.
Can bloat go away on its own?
None of the veterinary sources reviewed describe waiting at home as a safe plan, and owners cannot tell a self-limiting stretch of the stomach from a twisted stomach. Always get veterinary help.
What should I not do if I think my dog has bloat?
Do not induce vomiting, press or massage the belly, give medication or food, or delay the journey. Call the clinic and go.
How much does bloat treatment cost?
We did not find a reliable current figure that applies everywhere, so we do not give one. Costs vary by clinic and country, so ask the emergency clinic when you phone. An Australian study found that financial limits were linked to euthanasia before surgery (Anderson 2021).
Can small dogs get bloat?
The large studies focus on large and giant dogs, and risk is concentrated there. We did not find reliable numbers for small breeds. Any dog showing these signs should be seen urgently.
Does a raised bowl or slow feeder prevent bloat?
Raised bowls: the evidence points the other way (Glickman 2000). Slow feeders: we did not find a trial that shows they prevent GDV, although slowing a fast eater is a low-risk step because eating speed was associated with risk.
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
- 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.
- Glickman LT, Lantz GC, Schellenberg DB, Glickman NW. A prospective study of survival and recurrence following the acute gastric dilatation-volvulus syndrome in 136 dogs. J Am Anim Hosp Assoc. 1998;34(3):253-259. PMID 9590454. DOI 10.5326/15473317-34-3-253.
- 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.
- 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.
- 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.
- Song KK, Goldsmid SE, Lee J, Simpson DJ. Retrospective analysis of 736 cases of canine gastric dilatation volvulus. Aust Vet J. 2020;98(6):232-238. PMID 32253749. DOI 10.1111/avj.12942.
- 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.
- Ward MP, Patronek GJ, Glickman LT. Benefits of prophylactic gastropexy for dogs at risk of gastric dilatation-volvulus. Prev Vet Med. 2003;60(4):319-329. PMID 12941556. DOI 10.1016/s0167-5877(03)00142-9.
- 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.
- Chewy Education. The Signs of Bloat in Dogs, and How To Prevent It (undated retailer article, used only to describe signs). chewy.com
- Ontario SPCA and Humane Society. What is bloat and why is it so dangerous for dogs? Dr. Joey Tang, DVM, May 12, 2025 (page read; automated HTTP check blocked).
This article is general information, not veterinary advice, and cannot diagnose your dog. If your dog shows any sign described here, contact an emergency veterinarian immediately.