# Gas in Horses: Is It Normal and How to Help Gas in horses is a normal part of digestion, and horses do pass gas, often several times a day. Most of the time you will never notice it, and that is fine. Problems start when gas builds up faster than it can move, which can cause bloating and a painful form of colic. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Passing gas is normal for horses. The digestive system ferments fiber in the hindgut and produces gas that exits through the rectum. - Mild gas usually resolves on its own with movement, fresh water, and normal turnout. - A horse with a bloated, tight belly plus pawing, flank watching, or rolling needs a veterinarian the same day. - Never give human gas remedies, oils, or painkillers without veterinary guidance. Some can mask or worsen the problem. - Sudden, severe abdominal distension is an emergency. Call your veterinarian immediately. ## What Gas in Horses Actually Is Horses are hindgut fermenters. Their large colon and cecum hold a huge population of microbes that break down fiber from hay and pasture. That fermentation produces gas as a normal byproduct. Most of it is absorbed or passed out through the rectum without any drama. A healthy horse may pass gas quietly during exercise, after a meal, or when stretching. You might hear it, you might smell it, and you might never notice at all. All of those are normal. The trouble begins when gas production outpaces the horse's ability to move it along. Gas can become trapped in a segment of the gut, causing the intestine to stretch. Stretching triggers pain, and that pain is what veterinarians call gas colic. Abdominal distension, or a bloated look, is a visible sign that gas or fluid is building up [1]. ## Signs Owners Notice Some signs are mild and easy to miss. Others are hard to ignore. ### Normal or mild gas - Occasional passing of gas with no other signs - A soft, normal belly - Normal appetite, manure output, and attitude - Brief gassy sounds from the abdomen ### Signs that suggest a problem - A tight, swollen, or bloated belly (abdominal distension) [1] - Pawing at the ground or on hard surfaces [1] - Restlessness, getting up and down, or rolling side to side [1] - Looking at the flank [1] - Grinding the teeth (bruxism) [1] - Loss of appetite (anorexia) [1] - Decreased or absent manure - Signs of dehydration, such as dry gums or a prolonged skin tent [1] Severe distension can appear within hours. In one reported case, a young horse developed severe abdominal distension over just a few hours and needed surgery [2]. That speed is why bloating deserves a phone call, not a wait-and-see approach. ## Causes and Risk Factors Gas colic has many possible triggers. Often you will never know the exact cause. ### Diet and management - Sudden changes in hay, grain, or pasture - Too much rich grass, especially in spring - Large grain meals that overwhelm the hindgut - Moldy or poor-quality forage - Not enough water, which slows gut movement - Limited turnout and long periods standing in a stall ### Physical and anatomical factors Some horses have structural problems that trap gas or twist the gut. A malformation of the mesocolon, the tissue that supports the colon, caused severe distension and colic in a 7-month-old foal [2]. Other causes of a bloated abdomen include masses, fluid accumulation, and urinary problems. A young filly with an ovarian tumor developed abdominal distension along with other severe signs [3]. A newborn foal with a bladder defect also showed abdominal distension, though that case involved urine in the abdomen instead of gas [4]. These examples matter because a bloated belly is not always gas. Your veterinarian needs to sort out the cause. ### Stress and travel Transport, competition, and changes in routine can slow gut motility and let gas accumulate. Horses are creatures of habit, and their guts reflect that. ## How Veterinarians Diagnose the Problem Your veterinarian starts with a physical exam. They check heart rate, gum color, gut sounds, and the degree of abdominal distension. Heart rate, mucous membrane color, and distension are used to grade how severe the colic is [5]. Next comes a rectal palpation, which lets the vet feel the intestines and check for gas-filled loops or displacement [1]. A nasogastric tube may be passed to relieve gas and fluid from the stomach. In one colic case, the horse showed increased intestinal motility on rectal palpation along with distension and other signs [1]. Blood work can help. Certain markers rise with colic severity. Tumor necrosis factor alpha (TNFα) showed the best diagnostic accuracy in one study, with 100% sensitivity and 95% specificity for non-strangulating colic at a cutoff above 24 mg/l, and 100% sensitivity and specificity for strangulating colic at a cutoff above 33 mg/l [5]. Haptoglobin and other markers were also measured [5]. Ultrasound and imaging help when the exam does not explain the distension. In the filly with the ovarian tumor, ultrasound and clinical findings revealed the mass and related complications [3]. In the foal with the bladder defect, ultrasound showed free fluid, and abdominocentesis confirmed the diagnosis [4]. ## Treatment Options Treatment depends on the cause and severity. Mild gas colic often responds to simple measures, while severe cases need hospital care. ### At home, with veterinary guidance - Hand walking to encourage gut movement - Fresh water available at all times - Small, frequent meals of familiar forage - Removing grain or rich grass until the horse is back to normal Do not give any medication unless your veterinarian prescribes it. Pain relief, anti-spasmodic drugs, and other treatments are dosed based on the individual horse's weight and health. In the reported colic case, treatment included intravenous fluids for rehydration, an anti-spasmodic given twice intravenously, a pain reliever, omeprazole, sodium bicarbonate given twice intravenously, and an antibiotic [1]. Those choices were made by a veterinarian after examining the horse. Your horse may need something completely different. ### Veterinary and hospital care - Nasogastric decompression to release gas and fluid - Intravenous fluids to correct dehydration [1] - Pain management and anti-spasmodic medication [1] - Surgery when the gut is displaced, twisted, or blocked In the foal with the mesocolon malformation, painkillers did not control the pain and distension increased, so the team performed an exploratory laparotomy. They found and corrected a right dorsal displacement and torsion of the colon, then sutured the mesentery. The foal recovered well and was doing fine months later [2]. ## Recovery, Outlook, and Long-Term Management Most simple gas colic cases improve within hours once gas moves and pain is controlled. In the reported case, symptoms resolved completely within 12 hours of starting treatment [1]. Recovery after surgery depends on what was fixed. The foal that had mesocolon surgery was recovering well a few months later, and the owner was satisfied with the outcome [2]. Long-term management focuses on consistency: - Keep forage changes gradual over one to two weeks - Feed small meals more often instead of one large grain meal - Make sure water is always clean and available - Provide daily turnout and movement - Limit rich pasture during rapid growth periods - Schedule regular dental care so your horse chews properly If your horse has repeated bouts of gas or colic, work with your veterinarian on a long-term plan. Recurrent colic can point to a deeper problem that needs a different approach. | Situation | What you may see | What to do | |---|---|---| | Normal gas | Occasional passing of gas, normal appetite and manure | No action needed | | Mild gas colic | Mild bloating, pawing, flank watching, still eating | Call your vet, hand walk, monitor closely | | Moderate to severe colic | Tight bloated belly, rolling, not eating, no manure | Call your vet now, do not wait | | Emergency signs | Severe pain, unrelieved by walking, rapid decline | Call your vet immediately or go to a hospital | ## Prevention You cannot prevent every case of gas colic, but you can lower the odds. - Feed a consistent, high-fiber diet based on good-quality hay - Introduce any feed change slowly - Avoid sudden access to lush pasture - Keep a steady daily routine with turnout and exercise - Provide constant access to fresh water - Watch for early signs and act quickly Cold weather can change water intake and management routines, so pay extra attention to hydration and forage in winter. For more on seasonal care, see [Caring for a Horse in Winter](/knowledge/veterinary-medicine/equine-care/horse-winter-care). If you also keep dogs or cats, gas in other species has its own causes and meanings, such as [Why Does My Dog Have Bad Gas?](/knowledge/veterinary-medicine/nutrition/why-does-my-dog-have-bad-gas) and [Why Does My Cat Have Gas?](/knowledge/veterinary-medicine/nutrition/why-does-my-cat-have-gas). ## Limitations and When to Contact a Veterinarian This article cannot tell you what is happening inside your specific horse. Only a veterinarian who examines your horse can do that. Individual cases need a veterinarian. Call your veterinarian the same day if your horse: - Has a bloated or tight belly - Is pawing, flank watching, or lying down more than usual - Has a reduced appetite or is not eating - Has decreased or absent manure - Seems mildly uncomfortable but is not improving Call immediately, day or night, if your horse: - Is rolling violently or cannot be kept up - Has severe pain that does not ease with walking - Has a rapidly swelling abdomen - Shows signs of dehydration or shock, such as dry gums or cold extremities - Is declining quickly Do not wait to see if it passes. Gas colic can progress fast, and early treatment gives the best chance of a good outcome. ## Frequently Asked Questions ### Is it normal for horses to have gas? Yes, passing gas is a normal part of equine digestion. Horses ferment fiber in the hindgut, and gas is a natural byproduct that usually exits without any problem. You may rarely notice it, and that is normal too. ### Do horses pass gas a lot? Horses pass gas regularly, but most of it happens quietly and goes unnoticed. The amount varies with diet, activity, and individual digestion. A sudden change in how much gas you notice, especially with bloating or discomfort, is worth a call to your veterinarian. ### Can gas cause colic in horses? Yes, trapped gas can stretch the intestine and cause pain, which is often called gas colic. Mild cases often resolve with movement and supportive care. Severe or persistent cases need veterinary treatment, and some cases turn out to have a structural cause instead of simple gas [2]. ### What should I do if my horse looks bloated? Call your veterinarian and describe what you see, including appetite, manure, and behavior. Hand walking may help while you wait, but do not give medication on your own. A bloated belly can have several causes, and some are serious [3][4]. ### How can I help my horse pass gas safely? Encourage gentle movement, offer fresh water, and keep meals small and familiar. If your horse is uncomfortable, bloated, or not eating, contact your veterinarian instead of trying home remedies. Pain relief and other treatments should be prescribed based on your horse's weight and health. ## Related Articles - [Why Does My Dog Have Bad Gas?](/knowledge/veterinary-medicine/nutrition/why-does-my-dog-have-bad-gas) - [Why Does My Dog Have Bad Breath And Gas](/knowledge/veterinary-medicine/dental-care/why-does-my-dog-have-bad-breath-and-gas) - [Why Does My Cat Have Gas?](/knowledge/veterinary-medicine/nutrition/why-does-my-cat-have-gas) - [Equine Respiratory Physiology: Exercise and Gas Exchange Dynamics](/knowledge/veterinary-medicine/veterinary-anatomy-physiology/equine-respiratory-physiology-exercise-gas-exchange-dynamics) - [Caring for a Horse in Winter](/knowledge/veterinary-medicine/equine-care/horse-winter-care) - [Feeding Horses: Forage, Grain, and Body Condition](/knowledge/veterinary-medicine/equine-care/feeding-horses-guide) ## References 1. [Chronic spasmodic colic management in a thoroughbred horse: A case report from Bangladesh](https://pubmed.ncbi.nlm.nih.gov/42376547/). Open veterinary journal, 2025. 2. [Malformation of a Mesocolon as a Cause of Colic in an Arabian Foal](https://pubmed.ncbi.nlm.nih.gov/34564587/). Veterinary sciences, 2021. 3. [Malignant ovarian teratoma in a Lusitano filly: Diagnostic challenges and clinical significance](https://pubmed.ncbi.nlm.nih.gov/41936971/). Journal of equine veterinary science, 2026. 4. [Case Report: Mesh repair of a urinary bladder dorsal wall defect following repeated cystorrhaphy in a warmblood foal](https://pubmed.ncbi.nlm.nih.gov/41988346/). Frontiers in veterinary science, 2026. 5. [Diagnostic performance of specific oxidative stress biomarkers, acute phase proteins, and certain trace elements in different severities of equine colic](https://pubmed.ncbi.nlm.nih.gov/40832000/). Journal of equine science, 2025. ## Further Reading - [Merck Veterinary Manual: Horse Owners](https://www.merckvetmanual.com/horse-owners)