Jonkheer Z is a 13-year-old, Zangersheide stallion with two FEI World Cup Finals already under his belt with his 24-year-old rider Karl Cook. Owned by Cook's mother, Signe Ostby, "Jonny" lives at the family’s Pomponio Ranch in San Gregorio, Calif. He and Cook compete in the FEI-level grand prix classes and Jonny also stands at stud whenever his traveling schedule allows.
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