Psyllium Husk for Horses: Can It Help Prevent Sand Colic?

For horse owners in Western Australia, sandy paddocks are often just part of everyday life. But while sandy soils might be unavoidable, the risk of sand accumulating in your horse's digestive system is something worth taking seriously.

Sand colic is a familiar concern, particularly for horses grazing on sparse pastures or eating feed directly from sandy ground. One of the most commonly recommended supplements for managing this risk ispsyllium husk.

But how effective is psyllium at preventing sand colic? Can it actually remove sand from your horse's digestive tract? And is supplementation enough to keep your horse safe?

The answer isn't quite as straightforward as you might think.

Let's explore how psyllium works, what the research tells us and the practical steps you can take to help protect your horse's digestive health.

What Is Sand Colic?

Sand colic occurs when horses ingest sand or soil that accumulates in their gastrointestinal tract, particularly the large colon.

Horses can accidentally consume sand while grazing close to the ground, eating hay from sandy paddocks or picking up spilled feed.

While small amounts of sand may pass naturally through the digestive system, excessive accumulation can cause irritation, inflammation and, in more serious cases, intestinal obstruction.

Possible consequences include:

• Recurrent episodes of abdominal discomfort or colic

• Loose manure or diarrhoea

• Reduced appetite and weight loss

• Intestinal irritation and inflammation

• Severe impaction requiring veterinary treatment or surgery

Importantly, some horses can accumulate substantial amounts of sand without displaying obvious symptoms.

This makes prevention and early recognition particularly important.

Why Are Some Horses More Susceptible Than Others?

You might have several horses grazing in exactly the same paddock, yet only one develops sand colic.

Why?

The amount of sand ingested can vary considerably between individuals.

Some horses graze closer to the soil, while others are more inclined to pick through bare patches or eat spilled feed from the ground.

Differences in feeding behaviour, pasture availability and individual digestive health may also influence the risk.

Horses living in groups may face additional challenges, particularly where competition for feed encourages them to eat quickly or forage in less desirable areas.

This means that even if one horse is affected by sand colic, the other horses sharing its paddock shouldn't automatically be considered free from risk.

What Is Psyllium Husk and How Does It Work?

Psyllium husk is a natural source of soluble fibre derived from the seeds of thePlantago ovata plant.

You might recognise psyllium as an ingredient in human fibre supplements such as Metamucil.

When psyllium comes into contact with water, it absorbs moisture and forms a thick, gel-like substance.

In horses, this gel-forming property is thought to help move intestinal contents, including sand, through the digestive tract.

However, although psyllium has long been used for sand management, research has produced mixed results regarding its effectiveness when fed alone.

Studies suggest that psyllium may be more effective in treating diagnosed sand accumulation when combined with other veterinary treatments, particularly magnesium sulphate.

This distinction is important becausefeeding psyllium as a preventative supplement is not the same as treating a horse with an established sand accumulation.

What Does the Research Say About Psyllium?

Recent Australian research has provided some valuable insights into the treatment of sand accumulation in horses.

A 2025 study published in theAustralian Veterinary Journal, conducted by researchers at Murdoch University in Western Australia, investigated the effectiveness of a veterinary treatment combining psyllium, magnesium sulphate and paraffin oil.

The researchers examined 54 equids diagnosed with sand accumulation.

The study reported that:

• 81% of treated equids successfully cleared more than 75% of their measured intestinal sand area.

• The median treatment duration was four days.

• Treatment involved veterinary-administered combination therapy rather than psyllium supplementation alone.

The findings highlight the potential effectiveness of psyllium as part of a professionally managed treatment plan, rather than proving that routine supplementation prevents sand colic.

You can read the research abstract here:Medical Treatment of Sand Enteropathy in 54 Western Australian Equids (2025).

A separate scientific review published inEquine Veterinary Education concluded that evidence supporting psyllium alone for clearing established sand accumulation remains limited.

The takeaway? Psyllium may have a role in sand management, but reducing your horse's exposure to sand remains the most important preventative measure.

Should You Feed Psyllium as a Preventative Supplement?

Many horse owners routinely feed psyllium for several consecutive days each month, particularly during dry seasons or when horses are grazing sandy paddocks.

A commonly used approach is a five-to-seven-day course of psyllium each month.

However, the scientific evidence supporting this preventative schedule is limited, and there is no universally established dosing programme proven to prevent sand colic.

There is also insufficient evidence to confidently claim that continuous feeding causes psyllium to lose its effectiveness.

If you are considering using psyllium, it's worth discussing an appropriate product, dosage and feeding schedule with your veterinarian.

Consider your horse's body weight, diet, grazing environment and any previous history of sand accumulation.

Most importantly, psyllium supplementation should complement good paddock and feeding management rather than replace it.

Six Practical Ways to Reduce Your Horse's Risk of Sand Colic

Small changes to your horse's daily management can make a meaningful difference.

1. Keep Feed Off Sandy Ground

Avoid feeding hay or concentrates directly on the soil. Use suitable feed bins, hay feeders or rubber mats to minimise accidental sand ingestion.

Check beneath feeders regularly, as fallen hay can become contaminated with sand.

2. Manage Your Pastures

Overgrazed paddocks expose more bare soil, increasing the likelihood of sand ingestion.

Rotate paddocks where practical, avoid excessive stocking rates and provide supplementary forage when pasture becomes sparse.

3. Provide Plenty of Quality Forage

Horses are designed to consume fibre throughout the day.

Providing adequate pasture or hay supports normal digestive function and can reduce the need to graze extremely close to sandy soil.

TheMSD Veterinary Manual recommends supplementary hay and appropriate feeders for horses kept on sandy, overgrazed pastures.

4. Pay Attention During Dry Conditions

Western Australia's hot, dry summers can leave paddocks particularly bare.

Monitor grazing areas closely and consider establishing designated feeding areas with firm, clean surfaces to minimise exposure to loose sand.

5. Ensure Fresh Water Is Always Available

Adequate hydration is essential for maintaining normal digestive function.

Check troughs regularly, particularly during hot weather, and ensure your horse has unrestricted access to clean drinking water.

6. Monitor Changes in Appetite and Manure

Get to know what's normal for your horse.

Changes in manure consistency, appetite, behaviour or body condition may indicate a digestive problem that requires further investigation.

Can You Test Your Horse's Manure for Sand?

A traditional method of checking for sand involves mixing fresh manure with water in a clear container or disposable glove.

As the manure breaks apart, heavier sand particles may settle at the bottom.

While this can demonstrate that your horse is passing sand, it has some important limitations.

A negative manure sand test does not mean your horse has no sand accumulated in its digestive tract.

Likewise, finding sand in the manure does not reliably indicate how much sand is present in the intestines.

Research has found that faecal sedimentation tests lack sufficient accuracy to diagnose significant intestinal sand accumulation.

If sand accumulation is suspected, your veterinarian may recommend abdominal ultrasound or radiographs, depending on the circumstances.

Radiography remains an important diagnostic method for identifying and assessing intestinal sand deposits.

Therefore, manure testing should never replace professional veterinary assessment.

Know the Warning Signs of Sand Colic

Recognising the early signs of colic can make a considerable difference to your horse's outcome.

Look out for:

• Pawing, flank watching or repeated lying down

• Rolling or appearing unusually restless

• Reduced appetite or refusal to eat

• Abnormal manure production or diarrhoea

• Repeated episodes of mild abdominal discomfort

• Sweating, increased heart rate or other signs of distress

Not every horse will display all of these symptoms, and signs can vary depending on the severity and cause of the problem.

If your horse is showing signs of colic, contact your veterinarian immediately.

Never assume sand is responsible simply because your horse lives on sandy soil.

Colic has many possible causes, some of which require urgent surgical intervention.

Do not administer psyllium, oil, laxatives or other treatments to a colicking horse unless specifically directed by your veterinarian.

The Bottom Line: Good Management Comes First

Psyllium husk is widely used in equine digestive management, particularly for horses living in sandy environments.

Although it has demonstrated benefits in certain veterinary treatment protocols, its effectiveness as a routine preventative supplement remains uncertain.

For horses grazing Western Australia's sandy paddocks, the best approach is to concentrate on reducing sand ingestion in the first place.

Providing adequate forage, feeding off the ground, maintaining healthy pastures and monitoring your horse's digestive health all contribute to reducing risk.

If you're considering adding psyllium to your horse's feeding programme, speak with your veterinarian about whether it's appropriate for your horse.

And if you need help choosing quality hay, fibre sources or nutritional supplements, the friendly team atOakford Stockfeeds is always happy to help.