Answer:
There are many Famous Horses in the world. Here are some of them in Categories
Famous Dressage Horses:
-Bolero
-Brantano II
-Brentina
-Donnerhall
-Florencio
-Furioso II
-Keltec Salinero
-Montevideo
-Poetin
-Sandro Hit
-Seldom Seen
Famous Eventing Horses
-Arrow
-Babamist
-Ben Faerie
-Biko
-Charisma
-Custom Made
-Dr. Peaches
-Eagle Lion
-Giltedge
-Golden Willow
-Happy Talk
-Headley Britannia
-Heyday
-Hideaway's Erin go Bragh
-JJ Babu
-Jenny Camp
-Kilkenny
-Little Tricky
-Merry Sovereign
-Might Tango
-Murphy Himself
-Poltroon
-Priceless
-Show of Heart
-Stream Lion
-Supreme Rock
-Tamarillo
-The Grasshopper
-The Gray Goose
-Theodore O'Connor
-Toytown
-Windfall II
-Winsome Adante
Horses in Film and Television
-The Adventures of Champion
-Black Stallion
-Bamboo Harvester
-Black Beauty
-Buttermilk
-Cass Ole
-Docs Keepin Time
-Downlands Cancara
-El Mokhtar
-Fury
-Mister Ed
-My Friend Flicka
-Popcorn Deelites
-Rex
-Texas Dandy
-Thunder
-Trigger
And here's a Link to Famous Racehorses http://en.wikipedia.org/wiki/Category:Racehorses