In 2012, Irish sport horse stallion Flexible was coming off a spectacular year. He, along with rider Rich Fellers, won the FEI World Cup (at 16 years of age – the oldest horse in the event) and also competed in the London Olympics. Flexible was named International Horse of the Year, and Fellers was named Equestrian of the Year by the United States Equestrian Federation (USEF). In 2013, however, Fellers noticed some mild lameness in Flexible, who was then examined by his primary caretaker in Oregon, Dr. Mark Revenaugh, a national level sport horse veterinarian and a renowned expert in the diagnosis and treatment of lameness and performance issues.
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