Furiuos D is a white racing horse that races at Springfield Downs horse track.
Bart races on him at the Springfield Downs horse track. After the horse loses, Homer gives him a make over and changes his name from Duncan to Furious D. The makeover gives the horse confidence and he wins the race.
Furious D is white with a rainbow mane that includes the colors:blue, purple, yellow,orange and green. He sometimes wears a leather jacket and has a confident attitude.He wears Lisa's bracelet as a nose ring. He intimidates the other horses by headbutting several of them and likes to do a victory dance after he wins. His more confident attitude also at times made him violent, such as exiting the race track after a race to chase off a paparazzi, with Nelson Muntz even noting this aspect by stating that the horse "don't take no guff from nobody" (and promptly received a massive beating from his friends Kearney Zzyzwicz and Jimbo Jones largely due to his use of the word "guff", as it was implied that he was meant to use a swear word instead of "guff" that time).