Persistent Coughing in Horses
A cough is a sign that something is irritating or affecting your horse's airways — and when it keeps happening, it deserves attention.
An occasional cough does not necessarily mean that a horse is unwell. Horses may cough briefly when dust or other material irritates the airways.
But a cough that keeps returning, happens regularly during exercise, appears at particular times of day or continues over several days can be telling you that something is affecting the respiratory system.
The important question is not simply "How do I stop the cough?" but:
"Why is my horse coughing?"
What is actually happening when a horse coughs?
Coughing is one of the body's protective mechanisms.
When receptors within the respiratory tract detect irritation, mucus or other material, the body produces a forceful movement of air intended to help clear the airways.
So the cough itself is not the disease.
It is a visible — and audible — sign of something happening within the respiratory system.
This distinction matters because several very different conditions can produce a similar-looking cough.
When does a cough become "persistent"?
There is no useful rule that says a cough becomes significant after an exact number of coughs.
Instead, look for a pattern or change from what is normal for your horse.
You may notice:
- coughing repeatedly during exercise
- coughing when exercise first begins
- coughing when the horse starts trotting or cantering
- coughing in the stable
- coughing around hay, bedding or sweeping
- coughing while eating
- coughing after travelling
- coughing accompanied by nasal discharge
- a cough that disappears and then repeatedly returns
- reduced willingness or ability to exercise
- heavier or more obvious breathing than usual
- a cough that persists for several days
The circumstances surrounding the cough can provide useful information for your vet.
Terms you may hear your vet use
Respiratory terminology can sound complicated, but many of the terms describe either where the problem is occurring or what is happening inside the airways.
Equine asthma
Equine asthma is an inflammatory disease of the horse's lower airways.
You may previously have heard terms such as RAO (recurrent airway obstruction), COPD, heaves or IAD (inflammatory airway disease). Veterinary terminology has changed, and many of these conditions are now discussed under the broader term equine asthma.
In everyday language, the horse's airways become inflamed and more reactive. Mucus may increase and the airways may narrow, making it more difficult for air to move freely.
Some horses show obvious breathing difficulties. Others may initially show little more than repeated coughing or reduced performance.
Airway inflammation
If your vet talks about airway inflammation, they mean that the tissues lining the respiratory passages have become irritated and inflamed.
This can make the airways more sensitive and can encourage mucus production and coughing.
Mucus or airway secretions
Your vet may describe finding mucus within the trachea or lower airways.
Mucus normally helps trap particles, but excessive mucus can be associated with airway inflammation or infection and may stimulate coughing.
Lower airway disease
The lower airways are the breathing passages deeper within the chest and lungs.
So when a vet talks about lower airway disease, they are distinguishing a problem in these areas from conditions affecting the nose, throat or other upper parts of the respiratory tract.
Respiratory infection
Viruses and bacteria can cause respiratory disease.
Equine influenza ("flu"), for example, commonly causes a dry, harsh cough alongside other signs of illness.
Other infectious respiratory diseases can also produce coughing.
This is particularly important where several horses on the same yard begin coughing or showing signs of respiratory illness.
Tracheitis or bronchitis
These words describe inflammation in particular parts of the airway.
Tracheitis means inflammation of the trachea — the horse's windpipe.
Bronchitis means inflammation affecting the larger branching airways within the lungs.
They describe where inflammation is occurring rather than necessarily telling you what originally caused it.
Why might my horse keep coughing?
There are many possible causes.
Dust and airborne particles
Stable environments can contain very high concentrations of tiny airborne particles.
Sources can include:
- hay
- bedding
- straw
- arena surfaces
- sweeping
- mucking out
- mould spores
- feed
- dried mud and dust
Some of these particles are small enough to travel deep into the respiratory system.
A stable can look perfectly clean while still containing large numbers of particles that you cannot see.
Equine asthma
Persistent or exercise-associated coughing can be one of the signs of equine asthma.
The condition ranges considerably in severity, so a horse does not have to be obviously struggling to breathe to have inflammatory airway disease.
Infection
Respiratory viruses and bacterial infections can cause coughing.
If a horse develops a cough alongside fever, nasal discharge, dullness, loss of appetite or swollen glands, infectious disease becomes particularly important to consider.
Poor ventilation
Respiratory health is affected not just by what bedding or forage you use, but by the horse's total exposure to airborne material.
Closing a stable tightly to keep it warm can sometimes create a worse respiratory environment by reducing air exchange.
Fresh-air movement is important.
Forage
Hay can be a significant source of respirable dust, mould spores and other particles.
A horse repeatedly placing its nose into dusty forage may be exposed for many hours every day.
Exercise
Exercise makes horses breathe more deeply and move much greater volumes of air.
This can make an underlying respiratory problem more noticeable.
That is why some owners first become aware of coughing when the horse starts work, even though the underlying airway irritation may already have been present.
Other causes
Not every persistent cough fits neatly into one category. Problems involving the upper airways, swallowing, aspiration and less common respiratory conditions may also cause coughing.
This is why persistent coughing should not simply be labelled as "dust allergy" without investigation.
The environment matters
One of the most useful things an owner can do is look at the horse's whole respiratory environment.
Ask:
What is this horse breathing for most of every 24 hours?
Consider:
- ventilation in the stable
- forage quality
- how forage is fed
- bedding
- neighbouring horses' bedding and forage
- sweeping and mucking-out routines
- indoor school dust
- storage of hay or straw
- time spent outside
- travelling conditions
Changing one small thing may help, but respiratory management is often about reducing the horse's total exposure to airborne irritants.
What should I record?
If your horse is coughing repeatedly, keeping a simple record can be extremely useful.
Note:
- when the coughing occurs
- how frequently it happens
- whether it occurs at rest or during exercise
- what the horse was doing immediately beforehand
- whether it happens around forage or bedding
- any nasal discharge
- any change in breathing
- temperature if you are confident taking it safely
- appetite and general demeanour
- whether performance has changed
- whether any other horses are coughing
A short video or audio recording can also be useful if the horse does not cough while the vet is present.
When should I contact my vet?
Persistent or recurring coughing warrants veterinary advice, particularly when there has been a clear change from the horse's normal behaviour.
Seek veterinary advice promptly if coughing occurs alongside:
- increased breathing effort
- rapid breathing at rest
- fever
- significant nasal discharge
- dullness or depression
- reduced appetite
- poor performance
- difficulty recovering after exercise
- abnormal breathing noises
- several horses becoming affected
Difficulty breathing is an emergency.
If your horse appears to be struggling to breathe, contact your veterinary practice immediately.
If infectious respiratory disease is suspected, avoid unnecessary movement or contact with other horses until veterinary advice has been obtained.
How might a vet investigate persistent coughing?
The investigation will depend on the horse and the history.
Your vet may listen to the chest and airways and assess the horse's breathing, temperature and general condition.
Depending on what they find, further investigation might include procedures such as endoscopy, where a small camera is passed into the respiratory tract so the vet can examine the airways.
You may also hear terms such as:
Tracheal wash
Fluid is used to collect material from the trachea so that mucus, cells or microorganisms can be examined.
BAL — bronchoalveolar lavage
Often described informally as a lung wash, a BAL collects cells and fluid from deeper within the lower airways.
Examining those cells can help a vet understand what type of inflammation is occurring.
These investigations can help distinguish between problems that may look very similar from the outside.
Supporting respiratory health
Once serious or infectious causes have been considered and veterinary advice obtained where appropriate, management may form an important part of supporting a horse with sensitive airways.
The aim is generally to reduce unnecessary exposure to respiratory irritants while supporting normal respiratory function.
This may involve reviewing:
- ventilation
- forage
- bedding
- stable management
- dust exposure
- turnout
- exercise environment
Management should complement veterinary investigation and treatment rather than replace it.
JCG FreeStep Respiratory Support
Where nutritional respiratory support is appropriate, JCG FreeStep respiratory products can form part of the horse's wider respiratory-management programme.
They should sit alongside the fundamentals: identifying why the horse is coughing, reducing avoidable airborne irritation and following veterinary advice where coughing persists or other clinical signs are present.
A supplement should not be used to mask a persistent cough or delay investigation of its cause.
[SHOP JCG FREESTEP RESPIRATORY SUPPORT →]
The key thing to remember
Persistent coughing is a sign, not a diagnosis.
The cough is your horse telling you that something is stimulating or affecting the respiratory tract.
Sometimes the explanation may be relatively straightforward. At other times, similar-looking coughs can result from very different conditions.
Rather than concentrating only on stopping the sound of the cough, concentrate on finding and managing the reason it is happening.
Graphics for this condition
GRAPHIC 1 — HERO GRAPHIC
"Why Does My Horse Keep Coughing?"
Purpose: Main condition-page image and strong standalone educational graphic.
Visual concept:
A horse shown in a natural three-quarter view with a subtle anatomical overlay tracing the respiratory pathway from nostrils through the windpipe and into the lungs. Around the horse, restrained visual cues represent possible influences: forage dust, stable air, exercise and respiratory infection.
Main headline:
WHY DOES MY HORSE KEEP COUGHING?
Supporting line:
A persistent cough is a sign — not a diagnosis.
Footer / standalone identification:
JCG Health Hub | Persistent Coughing in Horses
jcgsupplements.com
The JCG identity and website must remain visible if the graphic is saved, shared or printed separately from the webpage.
GRAPHIC 2 — "What Is Your Horse Breathing?"
Purpose: Explain environmental respiratory exposure in a memorable way.
Visual concept:
Horse's head and respiratory tract surrounded by common environmental sources: hay, bedding, stable dust, indoor arena particles and poor ventilation. Very small airborne particles should be illustrated travelling towards the respiratory tract, reinforcing that the greatest respiratory challenge may not always be visible.
Headline:
WHAT IS YOUR HORSE BREATHING?
Supporting message:
Respiratory management is about the horse's total exposure — not just the dust you can see.
Small labels:
FORAGE • BEDDING • VENTILATION • STABLE DUST • ARENA DUST • MOULD SPORES
Footer:
JCG Health Hub | Respiratory Health
jcgsupplements.com
Designed to work both within the condition page and as a standalone printable/shareable educational graphic.
GRAPHIC 3 — "When a Cough Needs Attention"
Purpose: Give owners a simple decision-support graphic without attempting to diagnose the horse.
Visual concept:
A clear horse-owner observation graphic showing a coughing horse centrally with easily recognised signs positioned around it.
Headline:
WHEN A COUGH NEEDS ATTENTION
Look for:
Repeated coughing • Coughing during exercise • Nasal discharge • Fever • Reduced performance • Increased breathing effort • Other horses coughing
Prominent lower panel:
Persistent or recurring coughing? Speak to your vet.
Horse struggling to breathe? Contact your vet immediately.
Footer:
JCG Health Hub | Persistent Coughing in Horses
jcgsupplements.com
This graphic must remain understandable and retain its JCG source information when printed, downloaded or shared independently.