What Are the Early Signs of Colic in Horses?

Horses can go from bright and energetic to visibly distressed in a matter of hours, and one of the most common reasons is colic in horses. The word “colic” covers a wide range of abdominal conditions, from mild gas discomfort to life-threatening intestinal twists that require emergency surgery. For horse owners across Canada, knowing what to look for and when to act can mean the difference between a quick recovery and a catastrophic outcome. This guide walks you through the early warning signs, the most common causes, treatment expectations, and practical prevention strategies to keep your horse healthy year-round.

What Is Colic in Horses?

“Colic” is not a single disease. It is a broad term for any form of abdominal pain in a horse. Because the equine digestive system is long, complex, and anatomically inflexible, there are many points where gas, feed material, or intestinal segments can shift into trouble. A horse’s gastrointestinal tract stretches roughly 30 metres, with several sharp bends and narrow passages where blockages can form quickly.

Unlike most other animals, horses cannot vomit. Gas and fluid that build up in the gut have nowhere to go except forward, or in the worst cases, nowhere at all. This anatomical limitation is one of the primary reasons that equine veterinary care emphasizes rapid response the moment colic is suspected.

Why Equine Colic Is Dangerous

Colic is consistently ranked among the leading causes of death in horses. What makes it particularly serious is how fast it can escalate. A horse that appears mildly uncomfortable in the morning can develop a life-threatening intestinal torsion by afternoon. Gut tissue can begin to die within hours of a strangulating obstruction. There are several distinct forms that vary widely in severity:

• Gas colic: Caused by excessive gas buildup in the large intestine. Usually the mildest form and often resolves with treatment and light walking.
• Spasmodic colic: Caused by intestinal spasms, frequently linked to stress, diet changes, or parasite burden.
• Impaction colic: A blockage of feed material, most often in the large colon. Can become severe if not cleared promptly.
• Displacement colic: When a section of intestine shifts out of its normal position, causing pain and motility disruption.
• Strangulating colic: The most serious type, where blood supply to part of the gut is cut off. Almost always requires emergency surgery.
• Sand colic: Caused by accumulated sand or dirt in the intestines, common in horses that graze on sandy ground or eat from sandy surfaces.

Early Signs of Colic in Horses Every Owner Should Recognize

Catching the early signs of colic in horses is the single most powerful thing you can do as a caretaker. Early intervention dramatically improves outcomes and frequently prevents the need for surgery. The key is knowing your individual horse’s baseline so that even subtle behavioral shifts register as warning signs.

Mild Warning Signs of Colic in Horses

These signs may appear well before pain escalates. They should never be dismissed or left to resolve on their own:

• Restlessness or unusual irritability in an otherwise calm horse
• Repeated pawing at the ground or intermittent foot stamping
• Turning to look at the flank or nipping at the belly area
• Refusing grain, hay, or treats without an obvious reason
• Lying down more than normal or getting up and down repeatedly without settling
• Decreased or absent manure output over a period of several hours
• Mild, intermittent sweating not explained by heat or exercise
• Slightly elevated heart rate (normal resting rate in adult horses is 28 to 44 beats per minute)
• Yawning or stretching repeatedly, which can indicate abdominal tension

Severe Signs That Require Immediate Veterinary Contact

If any of the following are present, do not wait. Contact your veterinarian right away and consider the situation a veterinary emergency:

• Violent rolling or thrashing on the ground
• Continuous attempts to lie down or an inability to stand comfortably
• Profuse sweating at rest, especially along the neck, flanks, and behind the ears
• Rapid breathing exceeding 20 breaths per minute at rest
• Elevated pulse exceeding 50 beats per minute
• Repeated kicking at the abdomen
• Gum discoloration: pale, bright red, grey, or purple gums indicate circulation or organ problems
• Slow capillary refill time: pressing on the gums should result in a return to pink within two seconds
• Complete silence in the abdomen when listening to both sides with or without a stethoscope

Even symptoms that seem mild can deteriorate rapidly. When in doubt, call immediately. Recognizing when a situation requires urgent care is a skill that applies across all animals you care for. Our post on signs you should not ignore in a pet emergency covers how to evaluate urgency across different species when time is a factor.

Common Causes of Colic in Horses

Understanding the root causes of colic gives horse owners a clear pathway toward prevention. While no management strategy eliminates every risk, reducing the most common contributing factors substantially lowers the odds of an episode occurring.

Feed and Nutrition-Related Causes

• Abrupt feed changes: Switching hay types, introducing new grain, or rapidly increasing pasture access disrupts the gut’s microbial balance and can trigger spasms or fermentation-related gas.
• Insufficient forage: Horses need access to fiber continuously. Long gaps between feedings slow gut motility and allow the intestines to become sluggish.
• Excess grain: Large grain meals ferment quickly and can produce dangerous levels of hindgut gas or contribute to acidosis.
• Poor-quality or moldy feed: Spoiled hay or grain introduces irritants and toxins that disrupt the digestive lining.
• Sand ingestion: Horses eating off sandy or gravelly ground accumulate sand in the intestines over time, which can block passage of feed material.

Environmental and Management Causes

• Dehydration: Insufficient water intake is among the most preventable triggers of impaction colic, and the risk rises sharply during cold Canadian winters when horses tend to drink less water from cold troughs.
• Stall confinement without turnout: Reduced movement slows gut motility and allows material to stagnate in the intestines.
• Parasite burden: Internal parasites can damage intestinal tissue, cause spasms, or contribute to physical blockages.
• Stress and routine disruption: Transport, herd changes, weather shifts, and changes to daily feeding schedules all have measurable effects on gut function.
• Dental problems: Poorly maintained teeth result in incompletely chewed feed that is harder for the digestive system to move through, increasing impaction risk downstream.

When to Call a Veterinarian for Equine Colic

There is a simple rule every horse owner should internalize: if you are asking yourself whether to call the vet, call the vet. Equine colic does not reward hesitation. A veterinarian can assess your horse’s situation in minutes and determine whether pain relief, IV fluids, a nasogastric tube, or referral for surgery is needed. None of that can be done from a distance and none of it should be guessed at.

Clear Triggers That Require an Immediate Veterinary Call

• Any of the severe symptoms listed above (thrashing, discolored gums, absent gut sounds)
• Mild symptoms that persist for more than 30 minutes without improvement
• No manure produced in more than 8 to 12 hours
• Any colic episode in a foal, pregnant mare, or senior horse
• A known history of previous colic or intestinal surgery
• A horse that cannot be safely managed without thrashing or falling

What Your Veterinarian Will Do During a Colic Exam

When your vet arrives, the examination typically includes checking heart rate, respiratory rate, temperature, and capillary refill. They will listen for gut sounds on all four abdominal quadrants, perform a rectal examination to assess intestinal position and contents, and may pass a nasogastric tube to relieve gas or fluid pressure. Pain relief and antispasmodics are administered based on findings. If surgical intervention is indicated, your vet will coordinate a referral to an equine surgical facility.

The American Association of Equine Practitioners provides detailed guidance on colic types, treatment protocols, and what to expect during a veterinary colic examination.

If you want to know what happens when a colic case becomes critical, our detailed post on emergency veterinary care for horses explains how veterinarians prioritize treatment during high-pressure equine emergencies.

How to Prevent Colic in Horses

Prevention is not a guarantee, but it is highly effective. Most colic episodes have identifiable contributing factors that can be reduced or eliminated through consistent daily management. The habits you build now make a measurable difference in your horse’s long-term digestive health.

Feeding Strategies That Reduce Colic Risk

• Keep forage continuously available. The equine gut is built for constant grazing. Hay should be accessible at all times, or small frequent feedings should replace two large daily meals.
• Transition any feed change over 7 to 10 days. Whether changing hay type, introducing grain, or increasing pasture access, gradual transitions protect the gut microbiome from sudden disruption.
• Ensure fresh, clean water is always available. In winter, slightly warming water or using heated automatic waterers encourages horses to drink the volume they need. A horse drinking inadequate water is a horse at risk for impaction.
• Use feed tubs and hay nets. Keeping feed off the ground significantly reduces sand ingestion, especially in sandy paddocks or drylots.
• Inspect every feeding for mold or dust. Never offer hay or grain that smells musty, shows mold spots, or is excessively fine or dusty.
• Limit high-starch grain portions. If grain is part of the diet, divide rations across multiple small feedings throughout the day rather than delivering one large bucket at a time.

Routine Management Practices That Support Digestive Health

• Maintain a vet-directed deworming schedule based on periodic fecal egg counts rather than calendar-based rotation alone.
• Schedule annual dental examinations. Improperly chewed feed from worn or sharp teeth is a significant contributor to impaction colic. Annual floating (filing of sharp points) keeps the mouth functional and feed properly broken down before it enters the gut.
• Prioritize daily turnout and movement. Even light exercise or regular time outside a stall stimulates healthy intestinal motility. Stall-kept horses without exercise are at consistently higher risk.
• Maintain consistent daily routines. Feeding times, turnout schedules, and social groupings should change as little and as gradually as possible.
• Monitor manure every day. Changes in volume, texture, or frequency often precede a colic episode by hours and give you an early opportunity to intervene.
• Track weather changes. Colic incidence increases around dramatic temperature swings. Adjusting water intake strategies and monitoring feed consumption closely during these windows can catch problems early.

Recovering From a Colic Episode

Once the acute phase has resolved, the work is not finished. A horse that has colicked once is at elevated risk of a recurrence, particularly if the underlying cause was not identified and corrected. Recovery management is as important as the initial treatment.

What to Monitor After a Colic Diagnosis

Your veterinarian may recommend the following post-episode protocol:

• Gradual reintroduction of feed, starting with small amounts of high-quality hay
• Monitoring manure output at least every few hours for the first 24 hours post-treatment
• Encouraging water intake and offering electrolytes if indicated by your vet
• Temporarily restricting grain until gut function is fully confirmed restored
• A follow-up examination within 24 to 48 hours if the episode was moderate to severe
• Reviewing all feeding, water, and management routines to identify what may have contributed

Keeping a colic log is one of the most underused tools in horse ownership. Tracking feeding changes, water intake, weather, manure output, and behavioral shifts over time gives you and your veterinarian a pattern to work from when repeat episodes occur. You may also find our resource on common equine injuries and how vets treat them useful as part of a broader understanding of equine health issues your horse may face.

Horses That Face a Higher Risk of Colic

Any horse can colic at any age, but certain individuals carry a consistently higher baseline risk. These horses deserve extra attention and a personalized prevention conversation with your equine vet:

• Senior horses with naturally reduced gut motility
• Horses recovering from previous colic episodes or abdominal surgery
• Hard keepers or horses managing metabolic conditions such as Equine Metabolic Syndrome or Cushing’s Disease
• Horses with stereotypic behaviors such as cribbing or wind-sucking, which increase air and gas intake
• Stallions, who statistically have higher rates of certain intestinal displacement types
• Horses transitioning from dry winter hay diets to fresh spring pasture
• Horses in new environments, recently transported, or recently integrated into a new herd

Common Myths About Colic in Horses, Corrected

Barns are full of well-meaning advice passed down through generations, and not all of it holds up under veterinary scrutiny. Here are a few persistent myths worth correcting before they cost you valuable time:

• Myth: Rolling causes intestinal twisting. Rolling is a response to pain, not a cause of physical displacement. Intestinal torsion is an anatomical event that occurs independently. The real risk of uncontrolled rolling is physical injury to the horse. Keeping them calm and on their feet matters for safety, not to prevent a twist from happening.
• Myth: Walking cures colic. Light walking can stimulate mild gas colic and prevent dangerous falls, but it will not resolve an impaction, displacement, or strangulation. Walking is supportive, not curative. Veterinary care is still required.
• Myth: Only poorly managed horses colic. Colic affects well-nourished, carefully managed horses too. Excellent management lowers risk; it does not eliminate it entirely.
• Myth: If they are still eating, they are fine. A horse can begin colicking and still nibble at feed during the early stages. Do not use eating as a reliable indicator that everything is normal.
• Myth: You can give banamine and wait it out. Administering non-steroidal anti-inflammatory drugs (NSAIDs) like flunixin meglumine without veterinary direction can mask symptoms and delay accurate diagnosis. Always consult your vet before medicating.

Equine Colic Care in Manitoba

Horse owners throughout Manitoba depend on equine veterinarians who can respond quickly when colic strikes. At Rolling Plains Veterinary Corporation, our team provides responsive, experienced equine care across the region, including on-call support and emergency visits for suspected colic cases.

We understand that time matters enormously when a horse is showing signs of distress. Our veterinarians are equipped to manage a wide range of colic presentations, from mild gas discomfort requiring pain relief and monitoring, to complex impactions requiring intensive rehydration and decompression care. We also provide routine equine wellness services, dental care, and parasite management programs designed to reduce your horse’s overall colic risk throughout the year.

To speak with one of our veterinarians about your horse’s health or to schedule an appointment, visit our equine vet services page or contact us directly. Do not wait if your horse is showing signs of distress. Early intervention is always the right call.

Frequently Asked Questions About Colic in Horses

How long can a horse survive with colic?

Survival time depends entirely on the type and severity. Gas colic may resolve within a few hours with appropriate treatment. Impaction colic can persist for a day or more under medical management. Strangulating colic is a surgical emergency where the window for intervention is measured in hours, not days. Never adopt a wait-and-see approach without veterinary guidance.

What is the most common type of colic in horses?

Gas colic and spasmodic colic are the most frequently occurring forms and are generally the most manageable. Impaction colic is also very common, particularly in horses that reduce water intake during cold winter months. Strangulating or surgical colic is less frequent but carries the highest mortality risk of all types.

Can a horse recover from colic without veterinary care?

Very mild gas colic can occasionally resolve on its own with light walking and observation. However, it is not possible to determine the type or severity of colic without a veterinary examination. Attempting to manage colic without professional guidance risks allowing a treatable condition to become fatal. When in doubt, always call.

What should I do while waiting for the vet to arrive?

Remove feed and water to prevent further gut loading. Keep your horse as calm as possible and hand-walk them lightly if they are not thrashing. Do not administer any medications, including banamine or bute, without direct direction from your veterinarian. Masking pain without knowing the cause can delay an accurate diagnosis.

Does colic in horses always require surgery?

No. The majority of equine colic cases are resolved medically with pain management, fluids, and gut stimulation. Surgery is reserved for cases involving intestinal displacement, torsion, or strangulation where medical options are insufficient. Early diagnosis by a veterinarian gives the best chance of resolving the episode without surgical intervention.

Is colic more common during certain seasons?

Yes. Colic episodes tend to increase in spring when horses transition from dry winter hay to fresh pasture, and in late fall and winter when horses drink less water due to cold temperatures. The period immediately following any significant feed or environment change is always a higher-risk window and warrants extra monitoring.

How do I know if my horse has a history of colic that increases their future risk?

Speak with your veterinarian about your horse’s medical records. A history of even one significant colic episode, particularly surgical colic or impaction, means that horse should be on a prevention-focused management protocol. This includes regular dental care, consistent deworming, monitored water intake, and gradual feed transitions.

Categorised in: Horse Care

This post was written by Dr. Marc Phillipot