Answer

By Your Horse

Vet Malene Jørgensen advises:

The condition your horse has been diagnosed with has many names: recurrent laryngeal neuropathy, left recurrent laryngeal nerve paralysis, roarer or whistler. They all describe a neural affection of the nerves around the larynx.
This condition is often seen in young, large, Thoroughbred horses, Warmbloods and draught horses. It causes damage to the nerves, which activates the muscles to the vocal cords, resulting in an asymmetrical opening during respiration and partial obstruction of the airways. The grades are as follows:
● Grade one Normal movement of the vocal cords when inhaling and exhaling, at rest and in exercise.
● Grade two Transient asymmetry of the vocal cord movement when inhaling and exhaling. Normal conditions during swallowing and exercise.
● Grade three Asymmetry of the vocal cord movement when inhaling and/or exhaling, and during swallowing and exercise.
● Grade four Marked asymmetry.
● Grade five No movement on the affected side.
Grades one and two are normal, while grades three to five are abnormal. Performing an endoscopy while the horse runs on a high-speed treadmill is the only way to accurately establish the grading of your horse.
The only hope of a cure is surgery, which is very costly but, as your horse’s symptoms are mild, you could try a homeopathic remedy. My advice would be to seek help from a qualified veterinary homeopath or take a look at www.trusthomeopathy.org.