Horse Respiratory Health Welfare: Managing Equine Asthma and Dust Exposure

Equine asthma (formerly called heaves or RAO) is one of the most common chronic conditions in stabled horses. Management through reduced dust exposure significantly improves welfare and quality of life.

Key Facts

Equine asthma affects an estimated 14% of adult horses and up to 70% of sport horses in some studies
The condition ranges from mild (mild equine asthma) to severe (severe equine asthma/heaves) with different management requirements
Airborne dust from hay and bedding is the primary trigger - total dust exposure management is the most effective intervention
Soaking or steaming hay for 30+ minutes reduces respirable particle content by up to 90%
Haylage (fermented forage) eliminates hay dust while providing similar nutritional content
Bedding choice significantly affects dust exposure - paper, cardboard, or rubber matting is preferable to dust-extracted straw
Bronchodilators and corticosteroids provide symptomatic relief but do not address the underlying dust exposure cause

Welfare Considerations

Equine asthma welfare management illustrates a principle that applies across many chronic conditions: addressing the cause is more effective and more welfare-positive than managing the symptoms indefinitely. The horse experiencing repeated bronchospasm, labored breathing, and the discomfort of airway inflammation from hay dust is in genuine ongoing suffering that symptomatic medication reduces but does not eliminate. Switching to soaked or steamed hay, improved bedding, and maximizing turnout addresses the cause and often resolves clinical signs without ongoing medication. Owners who invest in environmental management rather than relying on inhalers and steroids typically produce better welfare outcomes for their horses, particularly over the long term where medication side effects become increasingly relevant.

What You Can Do

Assess your stable's dust exposure using a dust meter or by monitoring signs of respiratory irritation in stabled horses
Switch to soaked or steamed hay, or haylage, for horses with confirmed equine asthma
Choose low-dust bedding options including paper, cardboard, or rubber matting rather than straw for sensitive horses
Maximize turnout for horses with equine asthma - symptoms are typically much less severe when horses are outside
Work with your vet on an appropriate combination of environmental management and medication for horses with severe equine asthma