Don’t Let Dust Diminish Your Horse 

Avoid asthma and respiratory issues with barn management 

Have you ever walked in a barn, and felt like your lungs were being assaulted? Imagine how a horse feels, particularly if they spend hours in a stall.  When horses exercise, they take on upwards of 16 times as much air per second than their human owners.  Their lung capacity is enormous, as are their athletic capabilities, unless they are compromised by environmental factors. Much can be done from a management standpoint to minimize dust and harmful particulates in a horse’s environment while maximizing athletic function and general comfort in the process.

Even a horse not exhibiting signs of breathing issues may be under assault from airborne particles.  Every effort should be taken to minimize dust to practice prevention of irreversible breathing issues.

The Culprits We Can Control 

Round bales are not recommended.  Horses that spend their day buried neck deep in a round bale are inhaling a copious number of irritants.

-Hay and bedding are two of the top sources of mould and particulate in a horse’s environment

-Consider wetting or steaming hay prior to feeding or hay alternatives if the horse is triggered by the hay in its diet.  Research has been conducted on steamed hay vs soaked and the variable nutrient losses to consider, so be sure to discuss this option with your vet and nutritionist.

-Consider wood shavings over straw.

-Ventilation is a primary concern when building a barn but many stables are lacking. Ensure you have good airflow through your stable and periodically remove the cobwebs as you clean your barn.

– Horses take in 64-70 litres of air per second when exercising.  Footing in the arena needs to be regularly maintained to keep dust from rising into that air.

-Do not sweep dust and debris from the barn aisle into your horse’s stall, in fact, don’t sweep at all when horses are in the barn. Wet down the floor before you begin and wear a mask for your own respiratory health.

-Keep horses outside as much as possible, unless medical conditions require stalling.

Have a look at Equine Guelph’s Defend Against Dust fact sheet.

Also check out this awesome infographic shared by our sponsor, Boehringer Ingelheim.

Signs of Equine Asthma  


-nasal secretions from mucous production

-exercise intolerance

-difficulty expelling air

-heave line

-inflammation of lung epithelium and narrowing of Bronchus (can be confirmed by a BAL Bronchoalveolar lavage)

Dr. Dorothee Bienzle illustrates signs of heaves/asthma in this video.

Why Practice Diligent Prevention? 

Irreversible damage can be done by the cumulative effect from years of exposure to dust, mould and other particulate matter.

If a horse is coughing and asthma is suspected, the veterinarian will be looking closely at the horse’s environment to determine what is causing the irritation in the lungs. They will be looking at all potential causes which could include: dusty environments, smoke inhalation, pollen or other allergens and particles in the pasture or hay.

Don’t wait for your horse to start coughing to practice prevention.  If your horse begins to cough, call the vet right away to investigate the cause.  When dealing with respiratory ailments early diagnostics, aggressive treatment and environmental management are of paramount importance.

Articles of interest:

Learn more about maintaining a healthy environment for your horse with the next online offering of Equine Guelph’s Management of the Equine Environment course.

Notes to Editor:
Equine Guelph is the horse owners’ and care givers’ Centre at the University of Guelph in Canada. It is a unique partnership dedicated to the health and well-being of horses, supported and overseen by equine industry groups. Equine Guelph is the epicentre for academia, industry and government – for the good of the equine industry as a whole. For further information, visit

Story by: Jackie Bellamy-Zions, Equine Guelph

Photos available on request: High res image of Horse looking out of a stall.

Other low res images available too from article and fact sheet.

Photo Credit:  Roberto Quezada-Dardon (Unsplash) 

Caption: Every effort should be taken to minimize dust to help prevent irreversible breathing issues.

Story Link: 

Other Links:

Dr. Dorothee Bienzle – Promoting Respiratory Health – Reduce dust, moisture and avoid round bales

Steamed vs soaked hay

Research paper

Equine Guelph Defend against Dust fact sheet:

Boehringer Ingelheim infographic on Equine Asthma:

Video Links:

Dr. Dorothee Bienzle- First signs of heaves – Cough

Dr. Dorothee Bienzle – More indicators of heaves

Difficulty expelling air (w/video), secretions and changes in epithelium (BAL diagram)

Media Contact:
Jackie Bellamy-Zions
Communications & Administration
Equine Guelph
50 McGilvray Street
Guelph, Ontario, Canada N1G 2W1
Phone: 519-824-4120, ext. 54756