Inflammatory airway disease is a non-infectious respiratory disease which is associated with exercise intolerance, coughing and an increase in respiratory secretions. The disease commonly affects young athletic horses and it is estimated that 14-50 per cent of young horses could be affected at one time or another in their career. It is known that the disease may develop in a horse because of many potential factors. However, one environmental factor in particular plays an important role - dust. This is important to understand when treating this condition. What are the signs?