Diarrhoea
Helping Horse Owners Understand and Manage Diarrhoea
Supporting horse owners with practical information, early warning signs and appropriate nutritional support.
Diarrhoea can range from mildly loose droppings to frequent, very watery faeces. While a temporary change in droppings may sometimes follow a change in diet, grazing or routine, significant or persistent diarrhoea should never simply be assumed to be a digestive upset.
In some cases, diarrhoea can be associated with serious intestinal disease, infection or other conditions requiring prompt veterinary treatment.
This conditions page provides an overview for horse owners. Where diarrhoea is severe, persistent, recurrent or accompanied by other signs of illness, veterinary advice should be sought.
HERO GRAPHIC 1 — Diarrhoea in Horses: When Should I Call My Vet?
Purpose: A strong visual introduction to the page that also works as a standalone shareable or printable JCG information graphic.
Suggested visual: Horse viewed from the side with a simple progression beneath it:
Normal formed droppings → Soft/unformed droppings → Watery diarrhoea
Alongside this, a clearly separated “Call Your Vet” panel showing:
- Profuse or very watery diarrhoea
- Horse appears dull, weak or unwell
- Colic signs
- Reduced appetite or not eating
- Fever
- Signs of dehydration
- Blood in the droppings
- Diarrhoea that persists or repeatedly returns
- More than one horse on the yard affected
Footer on the graphic:
JCG Health Hub | Horse Owner Information
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Small-print statement:
This information does not replace veterinary advice. Significant diarrhoea in horses can require urgent veterinary assessment.
⚡ Quick Facts
- Diarrhoea describes droppings containing substantially more water than normal.
- There is an important difference between slightly loose droppings and profuse watery diarrhoea.
- Causes range from dietary and management changes to infectious disease and serious intestinal conditions.
- Horses with significant diarrhoea can lose large amounts of water and electrolytes.
- Dehydration can develop quickly in severe cases.
- Some infectious causes can spread between horses.
- Persistent, severe or unexplained diarrhoea requires veterinary investigation.
- Supplements may support normal digestive function in appropriate cases, but they do not treat diarrhoea or its underlying cause.
🩺 What Is Diarrhoea?
Normal horse droppings contain a considerable amount of water but are generally formed into recognisable faecal balls.
With diarrhoea, considerably more water remains within the faeces. Depending on the severity, droppings may become soft and poorly formed, completely unformed or almost entirely liquid.
A single episode of softer-than-normal droppings is not necessarily the same as clinical diarrhoea. Changes in grass, feed, excitement, travelling or stress can sometimes alter faecal consistency temporarily.
However, profuse watery diarrhoea is very different and can become a serious veterinary problem.
The important question is not simply whether the droppings look different, but why they have changed and how the horse is coping with that change.
What Can Cause Diarrhoea?
Diarrhoea is a clinical sign rather than a single disease. There are many possible causes.
Sudden Dietary Change
Rapid changes in forage, concentrate feed or grazing can disturb the normal environment of the hindgut.
Whenever possible, changes to a horse's diet should therefore be introduced gradually.
Lush or Changing Grazing
Changes in pasture, particularly rapid access to different or lush grazing, can alter the consistency of droppings in some horses.
Persistent diarrhoea should not, however, automatically be attributed to grass.
Stress and Management Changes
Transport, competition, changes of yard, altered turnout, separation from companions and other disruptions can affect digestive function.
Some horses develop temporarily loose droppings during periods of excitement or stress.
Antibiotic-Associated Diarrhoea
Antibiotic treatment can sometimes alter the populations of microorganisms within the horse's hindgut.
Diarrhoea developing during or following antibiotic treatment should be discussed with the treating veterinary surgeon.
Infectious Disease
Certain bacterial, viral and other infectious diseases can cause diarrhoea.
This is particularly important where:
- several horses are affected;
- a horse has recently travelled;
- new horses have arrived;
- the horse also has a fever; or
- diarrhoea is severe.
Appropriate isolation and biosecurity may be required while the cause is investigated.
Parasites
Some parasite burdens can contribute to intestinal disease and diarrhoea.
Modern parasite control should ideally be based on an appropriate veterinary or evidence-led worm-control programme rather than relying solely on routine worming at fixed intervals.
Intestinal Disease
Inflammation or disease affecting the gastrointestinal tract can interfere with normal absorption of water and nutrients.
There are numerous possible causes, which is why persistent diarrhoea may require veterinary investigation rather than simply a change of feed or supplement.
Sand Ingestion
Horses grazing or eating from sandy ground can ingest sand, which may accumulate within the gastrointestinal tract and cause digestive problems in some circumstances.
Other Medical Conditions
Diarrhoea can occasionally occur alongside other systemic or gastrointestinal disease.
This is another reason why recurrent or unexplained diarrhoea should be investigated rather than continually managed as a dietary problem.
GRAPHIC 2 — Loose Droppings or Diarrhoea? Know the Difference
Purpose: A particularly useful owner-education graphic that could be downloaded, printed for a tack room or shared independently.
Create a simple three-column visual:
1 — Formed Droppings
Recognisable faecal balls.
Usually normal
2 — Loose / Unformed Droppings
Soft piles or reduced formation.
Monitor the horse and consider recent changes in feed, grazing, stress or management.
Persistent or recurrent changes warrant investigation.
3 — Watery Diarrhoea
Large amounts of liquid faeces or repeated watery evacuations.
Veterinary advice required — particularly if the horse is unwell.
Include a highlighted message:
Look at the horse, not just the droppings.
Appetite • Behaviour • Temperature • Drinking • Colic signs • Hydration
Footer:
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If you are concerned about your horse, contact your veterinary surgeon.
🚨 When Is Diarrhoea an Emergency?
Seek veterinary advice promptly if diarrhoea is severe or if your horse shows signs such as:
- profuse or very watery diarrhoea;
- dullness or weakness;
- colic;
- loss of appetite;
- fever;
- increased heart rate;
- reduced drinking;
- signs of dehydration;
- blood in the faeces; or
- rapid deterioration.
You should also contact your vet if diarrhoea persists, repeatedly returns or has no obvious explanation.
Multiple horses developing diarrhoea should raise particular concern about a possible infectious or management-related cause.
💧 Why Dehydration Matters
The large intestine normally plays an important role in absorbing water.
During significant diarrhoea, large quantities of water can instead be lost in the faeces. Electrolytes including sodium, chloride and potassium may also be lost.
Severe losses can affect circulation and normal body function and may require veterinary treatment, including fluid and electrolyte therapy.
Always provide access to clean, fresh water unless your veterinary surgeon advises otherwise.
🦠 Protecting Other Horses
Until an infectious cause has been ruled out, unexplained significant diarrhoea should be treated cautiously.
Practical precautions may include:
- separating the affected horse where appropriate;
- using separate buckets and equipment;
- avoiding sharing grooming equipment;
- washing hands after handling the horse;
- cleaning contaminated areas appropriately;
- limiting unnecessary movement between affected and unaffected horses; and
- informing visiting professionals that there is a potentially infectious horse on the premises.
Your veterinary surgeon can advise whether additional biosecurity measures or diagnostic testing are required.
JCG Health Hub: See our Biosecurity & Infectious Disease information for more detailed guidance.
🔍 How Might Your Vet Investigate Diarrhoea?
The investigation will depend on the horse's history and clinical condition.
Your vet may consider:
- how long the diarrhoea has been present;
- recent dietary or grazing changes;
- recent travel;
- medication, particularly antibiotics;
- worming and parasite-control history;
- whether other horses are affected;
- temperature, heart rate and hydration;
- blood testing;
- faecal testing;
- infectious-disease testing; and
- further gastrointestinal investigations where appropriate.
The aim is to identify the underlying cause wherever possible because treatment depends upon why the diarrhoea is occurring.
🌱 Supporting Digestive Health
Once serious disease has been excluded or appropriately treated, management can play an important part in supporting normal digestive function.
Helpful principles include:
Make Dietary Changes Gradually
Introduce changes to forage, concentrate feed and grazing progressively whenever circumstances allow.
Base the Diet Around Appropriate Forage
Forage is fundamental to normal equine digestive function.
The amount and type required will depend on the individual horse, its health, workload and nutritional requirements.
Avoid Unnecessary Sudden Changes
Consistency in feeding and management can be particularly useful for horses prone to digestive disturbance.
Provide Constant Access to Fresh Water
Good hydration is essential for normal gastrointestinal function.
Consider Stress and Routine
Where loose droppings are repeatedly associated with travelling, competition or management changes, consider whether the horse's routine can be adjusted to reduce unnecessary stress.
Maintain an Appropriate Parasite-Control Programme
Use veterinary advice and appropriate testing to develop a parasite-control programme suitable for your horse and yard.
🟢 Nutritional Support for Digestive Health
Nutritional supplements do not treat diarrhoea and should never delay veterinary investigation of significant, persistent or unexplained diarrhoea.
Once an appropriate veterinary assessment has been made, nutritional support may form part of the longer-term management of some horses, particularly where the aim is to support normal hindgut function and digestive stability.
JCG Recommended Digestive Support
[PROMINENT PRODUCT PANEL — use product image, product name, short benefit statement and clear product button]
GG GastroFree
Nutritional support for normal digestive and gastrointestinal function.
GG GastroFree may be considered as part of the nutritional management of horses where supporting digestive health and a stable gastrointestinal environment is appropriate.
Best suited to: horses requiring ongoing nutritional support for normal digestive function, including those experiencing changes in management, diet or routine.
[VIEW GG GASTROFREE →]
GGM GastroFree
Targeted digestive nutritional support as part of a wider management programme.
GGM GastroFree provides another option within the FreeStep digestive-support range and may be considered according to the individual horse's nutritional requirements and overall management.
[VIEW GGM GASTROFREE →]
Important
Neither GG GastroFree nor GGM GastroFree is a treatment for diarrhoea, infectious disease or gastrointestinal disease.
If your horse currently has significant or unexplained diarrhoea, contact your veterinary surgeon before relying on a supplement or making substantial dietary changes.
GRAPHIC 3 — Supporting a Horse Prone to Loose Droppings
Purpose: A standalone management graphic with genuine ongoing value to owners, while naturally reinforcing the role of nutritional support without becoming a product advert.
Central horse image surrounded by six simple management areas:
FORAGE
Provide an appropriate forage-based diet.
CHANGE GRADUALLY
Introduce feed and grazing changes progressively.
WATER
Maintain constant access to clean, fresh water.
ROUTINE
Consider stress, travelling and management changes.
PARASITE CONTROL
Follow an appropriate evidence-led programme.
DIGESTIVE SUPPORT
Where appropriate, consider nutritional support for normal digestive function.
Bottom highlighted panel:
Persistent or recurrent loose droppings deserve investigation.
Don't continually mask a recurring problem without considering why it is happening.
Small secondary panel:
Explore digestive nutritional support at JCG Supplements
GG GastroFree | GGM GastroFree
jcgsupplements.com
Footer:
JCG Health Hub | Horse Owner Information
Supplements support nutrition and normal body function. They are not medicines and do not diagnose, prevent, treat or cure disease. Seek veterinary advice where appropriate.
📝 What Should I Monitor?
If your horse develops loose droppings, make a note of:
- when the change started;
- how frequently the horse is passing droppings;
- whether they are simply softer or genuinely watery;
- appetite;
- water intake;
- temperature;
- behaviour and energy levels;
- any colic signs;
- recent feed or grazing changes;
- recent travel or competition;
- recent medication;
- worm-control history; and
- whether any other horses are affected.
Photographs of the droppings and a simple record of changes can also be useful when speaking to your vet.
❓ Frequently Asked Questions
Are loose droppings always diarrhoea?
No. Horses can occasionally produce softer or poorly formed droppings without having severe clinical diarrhoea.
Repeated, persistent or very watery droppings require greater attention.
Can stress cause loose droppings?
Some horses develop loose droppings during travelling, competition, excitement or other changes in routine.
However, persistent diarrhoea should not automatically be blamed on stress without considering other causes.
Can changing grass cause diarrhoea?
Changes in grazing can affect faecal consistency, particularly when access changes rapidly.
Severe or persistent diarrhoea should still be investigated.
Should I give my horse a supplement if it has diarrhoea?
Do not use a supplement as a substitute for veterinary assessment of significant, persistent or unexplained diarrhoea.
Once an underlying problem has been investigated, digestive nutritional support may be appropriate as part of the horse's longer-term management.
Can diarrhoea be infectious?
Yes. Some causes can be infectious and may potentially spread between horses.
If infectious disease is suspected, contact your vet and introduce appropriate biosecurity precautions.
When should I call my vet?
Contact your vet if diarrhoea is severe, watery, persistent or recurrent, or if your horse appears unwell, develops colic, has a fever, stops eating or shows signs of dehydration.
The JCG Health Hub Approach
The JCG Health Hub is designed to help horse owners understand common health problems, recognise when veterinary attention may be needed and make informed management decisions.
We believe nutritional supplements can have a useful role in supporting horses, but the right product starts with understanding the problem.
For diarrhoea, identifying the underlying cause is particularly important.
Concerned about your horse now?
Significant or unexplained diarrhoea → Contact your veterinary surgeon
Looking for longer-term digestive nutritional support?
Explore the JCG digestive-support range
GG GastroFree | GGM GastroFree
[EXPLORE DIGESTIVE SUPPORT →]
Related JCG Health Hub Information
- Digestive Health
- Gastric Health & Gastric Ulcers
- Colic
- Parasite Control
- Biosecurity & Infectious Disease
- Managing Loose Droppings
- Feeding & Digestive Management
Important Information
The JCG Health Hub provides general educational information for horse owners and is not a substitute for veterinary diagnosis or treatment.
If your horse is unwell, you are concerned about its condition, or diarrhoea is severe, persistent or unexplained, contact your veterinary surgeon.