There is a very nice guide to equine horse programs called, "The Equine School and College Directory." It can be purchased from:
Harness Horse Youth Foundation
14950 Greyhound Court
Suite 210
Carmel, Indiana 46032
(317) 848-5132
You might also want to contact Robert Cacchionie, the Executive Secretary of the Intercollegiate Horse Show Association, Inc. He can be reached at: P.O. Box 108, Fairfield, Connecticut 06430 and at (203) 226-6941 (barn).