Equine Grass Sickness: What You Need to Know

This potentially deadly condition affects grazing horses. Learn about its clinical signs, treatments, and prognosis.

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Equine Grass Sickness: What You Need to Know
This horse with EGS exhibits weight loss and the characteristic 'tucked up' abdomen. | Photo: Courtesy CISCO-ONIRIS

By Anne Couroucé-Malblanc, DVM, PhD, Dipl. ECEIM, WEVA Secretary

Equine grass sickness (EGS) is a condition that affects horses’ central as well as peripheral nervous systems. As the name implies, EGS almost exclusively affects grazing horses and results in a characteristic array of clinical signs, most of which can be attributed to neuronal degeneration in the autonomic and enteric nervous systems

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