Equine Asthma and Respiratory Disease: Managing Airway Conditions in Horses

Respiratory conditions ranging from mild equine asthma to severe heaves (recurrent airway obstruction) cause significant discomfort and limit performance in affected horses.

Key Facts

Equine asthma spectrum disorder affects an estimated 14% of adult horses in temperate climates
Dust, mold spores, and endotoxins in hay and straw are the primary environmental triggers
Severe equine asthma (formerly heaves) causes labored breathing at rest, nostril flaring, and a heave line from chronic abdominal muscle use
Environmental management — soaking hay, using dust-free bedding, maximizing turnout — is the most effective treatment
Corticosteroids and bronchodilators control acute episodes but do not address the underlying environmental cause
Horses with equine asthma can live comfortably with appropriate management and lifestyle adjustment

Welfare Considerations

Equine asthma causes chronic respiratory distress that is both uncomfortable during mild phases and acutely distressing during severe episodes. The characteristic "heave line" — a muscular ridge along the flank from years of working to breathe — is visible evidence of prolonged suffering in severely affected horses. Management centers on reducing dust exposure: soaking or steaming hay, using dust-free bedding (shavings or paper rather than straw), maximizing outdoor turnout, and improving stable ventilation. These environmental interventions are often more effective than medication alone and address the underlying cause rather than just the symptoms.

What You Can Do

Soak or steam hay for horses with respiratory disease to reduce dust and mold spore exposure
Improve stable ventilation and transition to dust-free bedding materials
Maximize turnout time for horses with airway disease — fresh air is the most effective treatment
Work with your veterinarian on a combined environmental management and medical treatment plan