Digestion

How to Help Prevent Colic in Horses: Feeding & Management

Colic is one of the biggest concerns for horse owners, but it is not a single disease and there is no way to prevent every case. What owners can do is reduce known risk factors through consistent feeding, hydration, forage, movement, dental and parasite care — while understanding how diet and the hindgut environment fit into the wider picture.

Written by Ben Nedas Reviewed by Dr Rosemary Waring

Quick answer

What horse owners need to know

Not every case of colic can be prevented, but good feeding and management can reduce several recognized risk factors.

Keep forage at the center of the diet, provide clean water continuously, make feed and pasture changes gradually, avoid unnecessarily large grain meals, maintain regular movement, keep dental care up to date and use an appropriate parasite-control program.

Hindgut stability also matters. Sudden changes in rapidly fermentable carbohydrate can alter microbial fermentation, while inadequate water intake can increase impaction risk.

Know what is normal for your horse — particularly appetite, manure, water intake and behavior.

If you suspect colic, contact your veterinarian promptly. Colic means abdominal pain and has many possible causes, some of which can become serious quickly.

Start with the horse

Understanding what you're seeing

What you may notice

Knowing your horse's normal behavior is one of the most useful tools for recognizing abdominal discomfort early.

Possible colic signs include:

• Pawing
• Looking or kicking at the flank
• Stretching repeatedly
• Restlessness
• Repeatedly lying down and getting up
• Rolling
• Sweating without an obvious reason
• Reduced interest in feed
• Refusing forage
• Reduced manure production
• Dry or unusually small amounts of manure
• Abdominal distention
• Depression or unusual quietness
• Changes in normal posture
• A horse seeming unable to get comfortable

Not every horse displays dramatic signs.

Some horses with significant gastrointestinal problems may initially appear only slightly quieter than normal, stop finishing feed or pass less manure.

Equally, the severity of outward behavior does not reliably tell you exactly what is happening internally.

Any suspected colic should be discussed with your veterinarian.

Common causes

Colic describes abdominal pain rather than one specific disease.

Possible causes include:

• Gas accumulation and intestinal distention
• Feed impaction
• Sand accumulation
• Intestinal obstruction
• Altered intestinal motility
• Inflammation of the gastrointestinal tract
• Parasite-associated disease
• Intestinal displacement
• Torsion or volvulus
• Intussusception
• Enteroliths
• Strangulating lesions
• Changes associated with gastrointestinal infection or disease

Management factors can influence the likelihood of some of these problems.

Recognized contributors can include inadequate water intake, abrupt changes in feed or routine, excessive grain or rapidly fermentable feed, poor dental health, parasite burden and ingestion of sand or foreign material.

Other forms of colic can arise despite excellent management.

This is why “colic prevention” really means reducing known and avoidable risk factors while recognizing signs early and seeking veterinary assistance quickly when abdominal pain occurs.

What should you check first?

Colic prevention starts with understanding the horse's normal routine and identifying avoidable changes.

1. Water

Is clean water continuously available? Check troughs, buckets and automatic drinkers rather than assuming they are working.

2. Forage

How much forage does the horse actually receive, and has the source or quality recently changed?

3. Concentrate meal size

Consider how much concentrate and starch are being supplied at one time rather than looking only at total daily feed.

4. Feed changes

Has a new feed, hay batch, supplement or feeding rate been introduced suddenly?

5. Pasture

Has turnout increased significantly or has grass changed rapidly with season or weather?

6. Manure

Know what is normal for the horse. Reduced output, unusually dry manure, loose manure or excess fecal water can provide useful information.

7. Exercise and turnout

Has normal movement suddenly reduced because of injury, weather, travel or management changes?

8. Water intake in cold weather

Dry forage intake may increase in winter while voluntary drinking decreases.

9. Dental health

Poor chewing can contribute to inadequately processed forage and impaction risk.

10. Parasite control

Use an appropriate evidence-led program with your veterinarian rather than relying solely on routine calendar deworming.

11. Sand exposure

Horses eating from sandy ground may ingest material that accumulates in the gastrointestinal tract.

12. Previous episodes

A horse with a history of colic deserves an individualized review of possible recurring risk factors.

The objective is not to become anxious about every normal variation. It is to know the horse well enough that meaningful changes are noticed early.

Feeding & management steps

No management program can eliminate colic risk, but several practical habits can reduce avoidable digestive stress.

Useful principles include:

• Make good-quality forage the foundation of the ration
• Maintain consistent access to forage where appropriate
• Provide fresh, clean water at all times
• Check water sources daily, including during freezing weather
• Make feed and forage changes gradually
• Avoid sudden increases in grain or concentrate intake
• Divide required concentrate feed into smaller meals
• Review the starch content of the ration as well as the weight of feed
• Introduce increased pasture access gradually where possible
• Maintain regular turnout and appropriate movement
• Change exercise intensity gradually
• Keep dental care up to date
• Develop an appropriate parasite-control program with your veterinarian
• Avoid feeding directly from sandy ground where sand ingestion is a risk
• Check hay, pasture and feed for contamination or toxic material
• Monitor manure output and consistency
• Know your horse's normal appetite, water intake and behavior
• Keep records of previous colic episodes and possible preceding changes

Consistency is particularly valuable.

A horse's digestive tract and microbial population adapt to the diet and management pattern they experience. Repeated abrupt changes can challenge that stability.

For horses with previous colic episodes, work with your veterinarian and nutrition professional to identify individual risk factors rather than relying on a universal prevention program.

When to contact your veterinarian

If you think your horse may be showing signs of colic, contact your veterinarian promptly.

Signs can include pawing, repeatedly looking at the flank, stretching, restlessness, repeated lying down or getting up, rolling, sweating, reduced appetite, reduced manure production, abdominal distention or unusual depression.

Do not wait for a horse to show every classic colic sign. Some serious gastrointestinal problems initially produce relatively mild or intermittent discomfort.

Tell your veterinarian what you have observed, when it started, whether the horse has passed manure, whether it has eaten or drunk normally and whether there have been recent changes in feed, forage, water, exercise, medication or management.

Previous colic history, dental care and parasite-management history may also be relevant.

Only your veterinarian can assess the likely cause and determine whether treatment or referral is required.

Colic can progress quickly, so early veterinary assessment is more important than trying to establish at home whether the episode is “gas,” an impaction or another specific type of colic.

The digestive connection

Where digestion fits

Colic is not one disease, which means there is no single digestive pathway responsible for every case.

Some forms involve impaction or obstruction. Others involve excessive gas, inflammation, altered intestinal movement, displacement or twisting of the intestine.

However, feeding and the hindgut environment are important in several preventable or manageable risk pathways.

The horse's cecum and colon contain a large microbial ecosystem responsible for fermenting fiber. This fermentation produces short-chain fatty acids that provide energy and contribute to normal intestinal function.

Problems can arise when that ecosystem is subjected to sudden dietary change or receives large amounts of rapidly fermentable carbohydrate.

If excessive starch escapes digestion earlier in the gastrointestinal tract and reaches the hindgut, microbial populations and fermentation patterns can change rapidly. Pasture carbohydrates can also substantially alter what reaches the hindgut.

At the other end of the spectrum, inadequate water intake can contribute to dry intestinal contents and impaction.

Digestive risk management therefore involves both what enters the horse and what happens to it: forage, water, meal size, dietary consistency, upstream digestion and the downstream microbial environment all matter.

None of these factors explains every colic, but together they provide several practical opportunities to reduce avoidable digestive stress.

EquiNectar research

What the research tells us about the hindgut and colic risk

Recent research provides an increasingly detailed picture of why the hindgut microbial environment matters to colic risk.

A 2025 peer-reviewed scientific review examined the role of short-chain fatty acids — particularly acetate, propionate and butyrate — in equine colic, intestinal barrier function and inflammatory pathways.

These compounds are produced when hindgut microorganisms ferment dietary fiber. They provide energy within the digestive system and are involved in maintaining the intestinal lining, gut motility and regulation of inflammatory responses.

This is particularly interesting alongside published EquiNectar research.

In a study involving ten leisure horses, fecal metabolome and microbiome measurements were taken before supplementation and again after eight weeks of Enzyme Rich Malt Extract.

Mean total short-chain fatty acids increased from 1,376 ppb before supplementation to 2,077 ppb afterwards — an increase of approximately 51%.

Mean acetate increased from 505 to 737 ppb, propionate from 533 to 938 ppb and butyrate from 335 to 405 ppb.

Researchers also identified changes in microbial groups associated with fiber fermentation and short-chain-fatty-acid production.

The independent colic research and the EquiNectar study were conducted separately and should not be combined to claim that EquiNectar prevents colic.

What they provide is a biologically coherent connection: independent research identifies short-chain fatty acids and microbial stability as important features of equine hindgut health, while EquiNectar research has demonstrated measurable changes in those same areas.

10 horses Leisure horses assessed before and after supplementation

8 weeks Duration of the published EquiNectar microbiome and metabolome study

+51% Increase in mean total short-chain fatty acids after supplementation

What this research does — and doesn't — tell us

EquiNectar has not yet been tested in a randomized controlled trial in which the primary endpoint was the number of colic episodes.

That distinction matters, but it should not obscure the significance of what has been measured.

EquiNectar acts upstream by changing the substrate reaching the hindgut. When less undigested starch and other rapidly fermentable carbohydrate reaches the cecum and colon, the microbial community is presented with a different nutritional environment.

Across the EquiNectar research program, supplementation has been associated with measurable changes in that downstream environment, including:

• A significant increase in fecal pH in racehorses maintained on their normal high-starch diets
• Changes in the fecal microbiome, including increases in bacterial groups associated with fiber degradation and lactate utilization
• Reduced markers associated with unfavorable fermentation
• Increased short-chain fatty acids, including acetate, propionate and butyrate
• Changes in microbial populations consistent with a shift away from rapid carbohydrate fermentation
• Positive clinical changes recorded in horses under veterinary care for gastrointestinal problems

This is biologically important to colic risk.

Rapid fermentation of excess carbohydrate can increase acid and gas production, destabilize microbial populations and alter intestinal function. Changing the substrate reaching the hindgut — and therefore changing which microbial populations are favored — directly targets that pathway.

Where EquiNectar research demonstrates a reduction in bacteria associated with gas-producing or unfavorable fermentation, alongside greater populations involved in fiber degradation and lactate utilization, this represents a meaningful shift in the hindgut ecosystem rather than simply a change in an isolated laboratory marker.

The available research therefore provides strong mechanistic evidence that EquiNectar supports a more favorable hindgut environment relevant to recognized digestive and colic-risk pathways.

What it does not yet allow us to state is a numerical reduction in the incidence of colic itself.

Where EquiNectar fits

Supporting digestion as part of good management

EquiNectar is designed to support digestion and the gastrointestinal environment. It cannot guarantee that a horse will not develop colic and should not replace appropriate veterinary or management care.

Its Enzyme Rich Malt Extract naturally provides digestive enzyme activities including amylase, fructanase, cellulase, xylanase, beta-glucanase, protease, lipase and phytase.

These enzyme activities act on different components of feed and forage during digestion.

One important principle is reducing the amount of incompletely digested, rapidly fermentable carbohydrate reaching the hindgut. Excess starch or other rapidly fermentable substrate can alter microbial fermentation, lower pH and disrupt the normal hindgut environment.

EquiNectar research has demonstrated measurable changes in fecal pH, microbial populations and fermentation metabolites following supplementation.

This provides a scientific rationale for including digestive support within a wider colic-risk-management program.

That wider program remains essential: good-quality forage, sufficient water, gradual dietary changes, sensible concentrate meals, appropriate turnout and movement, dental care, parasite management and rapid veterinary attention when colic is suspected.

Explore EquiNectar

Common questions

Frequently asked questions

Can colic in horses be prevented?

Not every case of colic can be prevented. Colic simply means abdominal pain and can result from many different problems, including impaction, gas accumulation, inflammation, intestinal displacement, obstruction and other gastrointestinal disorders. However, good management can reduce several recognized risk factors. Consistent access to forage and clean water, gradual dietary changes, sensible concentrate feeding, appropriate turnout and exercise, dental care and an individually appropriate parasite-control program all form part of reducing avoidable risk. The goal is therefore risk reduction rather than a guarantee that a horse will never experience colic.

What are the first signs of colic in a horse?

Colic can look different from horse to horse. Possible signs include: • Pawing • Looking repeatedly at the flank • Stretching • Restlessness • Lying down more than normal • Repeatedly getting up and down • Rolling • Sweating • Reduced appetite • Reduced manure production • Abdominal distention • Depression or unusual quietness Some horses show dramatic pain while others show only subtle changes. These signs indicate abdominal discomfort but do not tell you what is causing it. If you suspect colic, contact your veterinarian promptly.

Can changing feed cause colic in horses?

Abrupt changes in feed or management can increase digestive risk. A new concentrate, different hay, sudden increase in grain, rapid pasture introduction or major change in routine can alter the type and amount of material reaching the gastrointestinal tract and hindgut microbial population. Where possible, introduce feed and forage changes gradually. This gives both the horse's digestive processes and hindgut microbial community time to adapt rather than being presented with a sudden change in substrate.

Does lack of water increase the risk of colic?

Yes. Adequate water intake is particularly important in reducing the risk of impaction. Water should normally be clean, fresh and freely available. Requirements vary substantially with temperature, exercise, lactation and whether the horse is eating pasture or dry forage. Cold weather deserves particular attention because horses may reduce water intake at the same time as consuming large amounts of dry hay. Check water sources every day and make sure freezing, contamination or equipment failure has not unexpectedly reduced access.

Can too much grain increase colic risk?

High grain or concentrate intake can increase digestive risk, particularly when large meals supply more rapidly fermentable carbohydrate than the horse can digest efficiently before it reaches the hindgut. Undigested starch entering the cecum and colon can alter microbial fermentation, increase acid production and destabilize the hindgut environment. This does not mean that all horses must avoid concentrate feed. Performance horses and poor doers may genuinely require additional dietary energy. The aim is to use appropriate feeds, avoid unnecessarily large meals and divide required concentrate intake into smaller portions.

Can grass cause colic in horses?

Pasture is an important and natural part of many horses' diets, but sudden changes in grass intake can alter hindgut fermentation. Lush pasture can provide large amounts of rapidly fermentable carbohydrate, while spring and autumn conditions may produce substantial changes in grass composition. The greatest management concern is often change rather than grass itself. Where practical, introduce increased grazing gradually, monitor horses closely during major pasture transitions and consider the individual horse's history, body condition and metabolic risk.

Can EquiNectar prevent colic?

No supplement can guarantee that a horse will not develop colic, and EquiNectar should not be presented as a treatment or preventive medicine for colic. EquiNectar is a digestive supplement designed to support the breakdown of feed and forage and the gastrointestinal environment. Research has shown measurable changes in the equine microbiome, fecal metabolome, short-chain fatty acids and fecal pH following supplementation. These findings are relevant because independent research increasingly links the hindgut microbial environment, fermentation products and intestinal barrier health with gastrointestinal resilience. They support a role for digestive management as one component of reducing digestive risk, but they do not establish that EquiNectar prevents individual colic episodes.

What horse owners need to know

Understanding what you're seeing

Where digestion fits

What the research tells us about the hindgut and colic risk

Supporting digestion as part of good management

Frequently asked questions

Related horse health guides

Hindgut Acidosis in Horses: Signs, Causes & Management

Gas & Bloating in Horses: Causes & What to Check

Loose Manure & Excess Fecal Water in Horses: Causes & What to Check

Poor Appetite in Horses: Causes & What to Check