Why Does My Dog Fart So Much? Causes and How to Reduce It
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Most dog farting is completely normal. It comes from two everyday things: gas made as gut bacteria break down food, and air your dog swallows while eating. A dog who suddenly farts far more than usual, or whose gas comes with diarrhoea or vomiting, is the exception worth looking into.
The good news is that most gassy dogs get better with a few simple diet and feeding changes.
I'll cover why it happens, how to reduce it, and when it is worth a vet visit.
- Most gas is normal, from gut fermentation and swallowed air.
- Diet and how fast your dog eats are the two biggest causes.
- Flat-faced breeds like French Bulldogs and Pugs gulp air and tend to be gassier.
- A digestible diet, a slow-feeder bowl, and gut support fix most cases within a week or two.
- See a vet if gas is suddenly frequent or comes with diarrhoea, vomiting, or weight loss. A swollen, hard belly is an emergency.
Why Does My Dog Fart So Much?
Dog farting is normal and mostly comes from two things: gas made as gut bacteria break down food, and air swallowed while eating.
Some wind is simply a sign the gut is doing its job. As food is digested, the bacteria in the large intestine ferment parts of it and produce gas, which has to go somewhere. On top of that, every time your dog eats or pants they swallow a little air, and that comes out the other end too.
But if it is excessive gas, it usually comes down to what your dog eats and how they eat it, not illness.
Their diet and ingredients
Some foods are harder to digest and can ferment in the colon, producing more gas. This is more common with high-fat formulas and certain fermentable fibres and legumes (beans, peas, lentils), though every dog tolerates ingredients differently.
Diet is often the first and most effective thing to review — switching to a more digestible, well-formulated diet, ideally on your vet's advice, is frequently the single biggest improvement you can make.
Eating too fast and swallowing air
A dog who inhales their dinner swallows a lot of air with it, and that air becomes gas. In fact, swallowed air is the largest single contributor to flatulence, and flat-faced, or brachycephalic, breeds take in even more as they eat and breathe, which is part of why they are often the gassiest.
Dairy, fatty foods, and table scraps
Many dogs are lactose intolerant, so milk, cheese, and ice cream are classic triggers. Rich, fatty table scraps overload digestion and feed the fermentation that makes gas.
A sudden change of food
Transitioning your dog's food too quickly upsets the balance of gut bacteria and commonly causes a burst of gas until things settle.
Too little exercise or excess weight
Sedentary and overweight dogs tend to be gassier, partly because movement helps the gut keep things moving along.
Underlying gut conditions
Less often, persistent gas points to something medical, such as inflammatory bowel disease, bacterial overgrowth, exocrine pancreatic insufficiency, parasites, or pancreatitis. These usually come with other signs like diarrhoea or weight loss, and our guide to pancreatitis in dogs covers one of them.
The gassiest dogs we see are often the flat-faced breeds, French Bulldogs, Pugs, and English Bulldogs, because they swallow so much air as they eat and breathe. With them, slowing the eating down with a slow-feeder bowl usually does more than any supplement.
How to Reduce Your Dog's Farting
Most dogs get noticeably less gassy with a few diet and feeding changes, given a week or two to take effect.
Choose a highly digestible diet
A quality, easily digestible diet generally produces less fermentation and less gas, and lower-fat foods with sensible fibre levels tend to suit gassy dogs well. If you're not sure what to look for, our guide to the best dog food ingredients walks through it.
Slow down a fast eater
A slow-feeder bowl or a puzzle feeder is one of the simplest, most effective fixes, because it cuts the air your dog swallows. Smaller, more frequent meals in a calm spot help too.
Cut the dairy and table scraps
Skip the milk, cheese, and rich leftovers, and keep treats simple and low in fat. For many dogs this change alone makes a clear difference.
Add gut support
A probiotic or synbiotic can steady the gut bacteria behind the smell. Browse our range of dog probiotics and digestive support, and our guide to supporting your dog's gut health has more.
Keep them moving and change food gradually
Daily exercise helps the gut keep things moving, and any change of food should be made gradually over about a week so the gut can adjust.
"Most gassy dogs I see are not sick, they are eating the wrong thing or eating it too fast. I would start with a slow-feeder bowl and a more digestible diet, and give it a couple of weeks. If the gas is suddenly worse, or there is diarrhoea or weight loss with it, that is when I want to take a closer look."
Dr Jack Ayerbe OAM
Veterinarian & Vets Love Pets Partner
Is Dog Farting Ever Serious? When to See a Vet
Occasional gas is normal, but see a vet if it is suddenly frequent, smells far worse than usual, or comes with diarrhoea, vomiting, weight loss, or a poor appetite.
The reassuring rule of thumb is that the smell on its own is not the worry. It is gas that is new, much more frequent, or paired with other signs that is worth investigating. Book a vet if you notice:
- Gas with diarrhoea or loose stool, or with vomiting
- Gas with weight loss, a dull coat, or a drop in appetite
- Gas with signs of tummy pain or obvious discomfort
Everyday gas is not the same as bloat. Bloat, or GDV, is a twisted, gas-filled stomach and a genuine emergency. A swollen, hard belly, repeated attempts to vomit that bring nothing up, heavy drooling, and restlessness need an emergency vet straight away. If your dog's abdomen looks distended and feels hard, treat it as urgent rather than waiting.
Vet-Recommended Products for Gut Recovery
Protexin Synbiotic D-C Capsules for Dogs and Cats
A vet-strength synbiotic capsule that pairs probiotics with a prebiotic, often used to settle digestive upsets and loose stools.
Why our vets recommend it: the prebiotic feeds the live probiotics, which helps restore gut balance after a bout of diarrhoea.
PAW DigestiCare Powder for Dogs and Cats
A daily gut-support powder for dogs prone to loose stools and sensitive tummies.
Why our vets recommend it: it supports a stable gut microbiome, which helps firm up stool and ease everyday digestive upsets.
"My dog used to take a while to do his business, but after I started giving him PAW Digesticare, he poops almost immediately as soon as we get to the park. And it is no longer hard and he hardly needs to strain. I will definitely continue to give him Digesticare!"
Ung Serene T.
Vets Love Pets Customer
Why Does My Dog Fart So Much FAQs
Why are my dog's farts so smelly?
The smell comes from gut bacteria fermenting food and producing sulphur compounds, the same family of smells as rotten eggs. Rich, fatty, and hard-to-digest foods feed that fermentation, so they tend to produce the worst offenders. On its own, a bad smell is rarely the problem. Frequency and any other signs matter far more.
Why does my dog fart in their sleep?
Dogs often pass gas in their sleep simply because they are fully relaxed, so the muscles that hold gas in let go. It is normal and not a cause for concern on its own. If it comes with loose stool or a swollen belly, mention it to your vet.
What foods make dogs fart?
The usual gas-producing foods are soybeans, peas, beans, dairy, and high-fat or spicy foods, along with rich table scraps. Sudden changes of food and poorly digestible diets also produce gas. Switching to a more digestible diet and cutting scraps is the fastest fix.
Can probiotics help with dog gas?
Yes, often. A probiotic or synbiotic helps balance the gut bacteria that ferment food and produce gas, which can reduce both the amount and the smell. They work best alongside a digestible diet and a slower eating pace, and usually take a week or two to show an effect.
How long does it take to reduce a dog's gas after a diet change?
Most dogs improve within one to two weeks of a diet and feeding change, once the gut bacteria have adjusted. Make the change gradually over about a week to avoid causing more gas in the short term. If there is no improvement after a few weeks, speak to your vet.
What to Do Next
A gassy dog is usually a diet-and-eating-habits puzzle rather than a sick one, and a few changes fix most of it. Start with a more digestible diet, a slow-feeder bowl, and a little gut support, and give it a week or two. The combination to act on is gas plus diarrhoea, vomiting, weight loss, or a hard, swollen belly, which is when a vet should take a look. A more digestible diet and a slower eating pace are the best places to start.
Veterinarian & Vets Love Pets Partner
BVSc
Dr Jack Ayerbe OAM is a distinguished Geelong veterinarian with over 50 years of experience, the founder of Newtown Veterinary Practice, and a dedicated advocate for animal welfare and ethics.
More articles from Dr Jack AyerbeReferences
- VCA Animal Hospitals on flatulence in dogs, including diet, swallowed air, and brachycephalic breeds, an international veterinary hospital network
- The MSD Veterinary Manual on gastric dilatation and volvulus (bloat), the global clinical reference for veterinarians
- VCA Animal Hospitals on exocrine pancreatic insufficiency, an underlying cause of chronic gas
