Equis ISSN 2398-2977

Whistling and roaring Owner Factsheet

Many horses of all types and ages have been observed to make an abnormal noise upon exercise. These horses and ponies are often referred to as whistlers or roarers. The noise produced can vary from barely audible to a loud roaring noise and is due to turbulent airflow through an abnormal airway. This finding is common in racing Throroughbreds and can be a cause of poor performance in athletic horses. In less severe cases, the problem may go undetected and may have no effect on the average horses athletic capabilities.

Image: An endoscopic view of a horse with severe RLN. The cartilage on the right side of the image (left side of the horse) will not open fully, resulting in a dramatic reduction in airway diameter.
©Vetstream Ltd

What is the larynx, what does it do?

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What causes whistling and roaring?

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How is RLN diagnosed?

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How is RLN treated?

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