Colic is a broad term for abdominal pain in animals, most commonly associated with horses. It’s not a single disease but a catch-all for dozens of conditions that cause gut pain, ranging from mild gas cramps that resolve on their own to life-threatening intestinal twists that require emergency surgery. While the term applies across species, horses are by far the most affected, and most veterinary discussion of colic centers on them. Cattle, dogs, and other animals experience abdominal emergencies too, though vets tend to use more specific diagnoses in those species.
Why Horses Are Uniquely Prone to Colic
The horse’s digestive system is almost perfectly designed to cause problems. Horses have an unusually long intestinal tract with dramatic changes in diameter at certain points, creating natural bottlenecks where food material can get stuck. Their large colon is loosely attached inside the abdomen, which allows sections to shift out of position or twist. And unlike dogs or cats, horses cannot vomit. If gas or fluid builds up in the stomach, there’s no way for it to escape upward. Without intervention, a distended stomach can actually rupture.
These anatomical quirks mean that even routine changes, like switching feed, traveling, or not drinking enough water on a cold day, can set off a colic episode.
Types of Equine Colic
Gas Colic
The most common and usually mildest form. Gas builds up in the stomach or colon, stretching the intestinal wall and causing pain. This often happens after a horse eats highly fermentable feeds like grain, lush grass, or beet pulp. The spike in fermentation produces volatile fatty acids that slow stomach emptying, trapping even more gas. Most gas colic resolves with a veterinary exam and pain relief, though severe gas distention in the colon can cause extreme pain.
Impaction Colic
This occurs when a mass of dry feed material gets lodged in the intestine, blocking the flow of digesta. The most common site is the pelvic flexure of the large colon, where the intestine narrows dramatically. Coarse hay, poor dental health, and insufficient water intake are the usual culprits. Impactions also occur in the cecum, the junction between the right dorsal colon and transverse colon, and occasionally in the small intestine. Ponies and miniature horses with limited water access are especially vulnerable. Treatment typically involves fluids delivered through a stomach tube to soften the blockage, though stubborn impactions sometimes need surgery.
Displacement and Torsion
These are the most dangerous forms. In a displacement, a section of the colon shifts to an abnormal position. One well-known example is left dorsal displacement, where the colon slides over a ligament between the spleen and left kidney, becoming trapped. In a torsion (or volvulus), the intestine actually twists on itself, cutting off blood supply. Large colon torsion is thought to be related to disproportionate gas buildup, though the exact trigger remains unclear. Both conditions frequently require emergency surgery.
Recognizing Colic Symptoms
Horses in colic pain show a recognizable set of behaviors. The classic signs include frequently turning to look at the belly, pawing at the ground, lying down and rolling repeatedly, and kicking or biting at the flank. You may also notice lip curling, teeth grinding, changes in posture (such as stretching out as if trying to urinate), and a generally depressed or withdrawn demeanor. Foals tend to roll onto their backs and can get stuck against a wall.
Heart rate is one of the most reliable indicators of severity. A normal resting heart rate for a horse is roughly 28 to 44 beats per minute. During colic, rates between 50 and 65 suggest moderate pain, 65 to 80 indicate severe pain, and anything above 80 signals excruciating distress. A sustained heart rate at or above 60 is a strong signal that the horse may need referral to a surgical facility. In the later stages of colic, an elevated heart rate often reflects the onset of shock rather than pain alone, which makes it an even more urgent sign.
How Veterinarians Diagnose Colic
The first and most important step is passing a tube through the nose into the stomach (nasogastric intubation). Because horses can’t vomit, this is the only way to check for and relieve dangerous fluid buildup. If significant fluid comes back through the tube, that typically points to a small intestine problem. This single step can be lifesaving by preventing stomach rupture.
Rectal palpation lets the vet feel for gas-distended loops of intestine, impactions (especially at the pelvic flexure), or organs that have shifted out of place. It carries some risk of injury to both the horse and the examiner, so it’s done selectively. Abdominal ultrasound is increasingly used in the field to visualize intestinal wall thickness, free fluid, and distended bowel segments without the risks of a rectal exam.
Treatment: Medical vs. Surgical
The majority of colic cases resolve with medical treatment. This usually means pain relief, fluid therapy, and monitoring. Pain management involves anti-inflammatory medications and, for more intense pain, sedatives or other analgesics. A spasmolytic agent can help relax intestinal muscle spasms in simple colic cases. Fluids can be given through the stomach tube to rehydrate impacted material, or intravenously for horses that are dehydrated or in shock.
Roughly 5 to 10 percent of colic cases require surgery. When they do, the outcomes are better than many owners expect. In a retrospective study of 185 horses that underwent colic surgery at a U.S. hospital between 2014 and 2021, about 79% survived to discharge. Among those discharged horses with follow-up data available, nearly 90% were still alive one year later. Early referral is the key factor. The longer a twisted or strangulated intestine goes without blood flow, the more tissue dies, and the worse the prognosis becomes.
Colic in Cattle
Cattle experience abdominal pain from a different set of problems, largely because their four-chambered stomach creates its own vulnerabilities. The most common surgical causes of colic in adult cattle are abomasal displacement (where the fourth stomach chamber shifts to the left or right side of the abdomen) and intestinal intussusception (where one segment of bowel telescopes into another). Abomasal displacement is especially common in high-producing dairy cows shortly after calving.
Surgical outcomes depend on the direction of displacement. Left displaced abomasum, corrected with a procedure that tacks the stomach back into place, has an 86 to 90% success rate. Right abomasal volvulus, which involves twisting and is more severe, has a 68 to 74% success rate. Cattle show colic differently than horses. They tend to kick at their belly, grunt, arch their backs, and reduce feed intake rather than rolling on the ground.
Abdominal Emergencies in Dogs
Veterinarians rarely use the word “colic” for dogs, but the closest equivalent is gastric dilatation-volvulus, commonly called bloat or GDV. This life-threatening condition occurs when the stomach fills with gas and then twists along its axis, trapping the gas inside and cutting off blood flow. Large, deep-chested breeds like Great Danes, German Shepherds, and Standard Poodles are most at risk. Signs include a distended abdomen, unproductive retching, restlessness, and rapid decline. GDV is diagnosed with X-rays and requires immediate surgery. Without treatment, it is almost always fatal.
Preventing Colic in Horses
Most colic prevention comes down to how you manage feeding, water, and parasites. A horse’s diet should be primarily forage: grass and hay. Grain and concentrates can supplement energy and protein, but too much starch at once is a well-known colic trigger. If grain is part of the diet, split it into two to four small meals (about 2 to 3 pounds per feeding for a 1,000-pound horse) spaced throughout the day rather than one or two large ones.
Water access matters more than many owners realize. Horses that don’t drink enough, particularly in cold weather when water sources may be icy, are at significantly higher risk for impaction. Clean, temperate water should be available at all times.
Sand colic is entirely preventable with good management. Never feed hay or grain directly off bare ground. Use tubs, hay racks with catch pans, rubber mats, or concrete pads. Horses grazing in sandy-soil areas are especially vulnerable to accumulating sand in the colon over time.
Parasite control also plays a role. Work with your vet to develop a targeted deworming schedule rather than rotating dewormers on a fixed calendar. Good pasture hygiene, including removing manure at least twice a week and dragging fields on hot, dry days to break up and desiccate parasite eggs, reduces the worm burden your horse is exposed to in the first place.