2005: two-year-old season Dylan Thomas made his first racecourse appearance in a maiden race at
Tipperary on 30 June. Ridden by
Kieren Fallon, he started even money favourite and won by a
length from Galantas. He was off the racecourse until 10 September when he ran in the Irish Breeders' Foal Levy Stakes at
Leopardstown. He took the lead two furlongs from the finish and won by three quarters of a length from Royal Power despite hanging badly to the right in the closing stages. Dylan Thomas was then sent to England to contest the
Group Three Autumn Stakes at
Salisbury on 8 October. Ridden by
Johnny Murtagh, he started 13/8 favourite, but after leading briefly in the straight he finished second by a neck to Blitzkrieg. The future
Dubai World Cup winner
Well Armed finished fourth. Three weeks later, Dylan Thomas was moved up to Group One class for the
Racing Post Trophy at
Doncaster. He made little impression and finished sixth of the seven runners behind Palace Episode.
2006: three-year-old season Dylan Thomas made his three-year-old debut in the
Derrinstown Stud Derby Trial over ten furlongs at Leopardstown on 14 May. Ridden by
Seamie Heffernan he took the lead early in the straight and stayed on strongly to win from his stable companion Mountain and the English challenger
Youmzain. On 3 June, he lined up for
The Derby. Ridden by Johnny Murtagh, he was sent to the lead after half a mile and stayed there until headed on the line by winner Sir Percy and runner-up Dragon Dancer. He subsequently won the
Irish Derby at the
Curragh, ridden by
Kieren Fallon. After a summer break, Dylan Thomas beat
Ouija Board in a thrilling finish to the
Irish Champion Stakes in September. In late September 2006, Coolmore took the unusual step of sending Dylan Thomas to run in the
Jockey Club Gold Cup at
Belmont Park, his first (and only) race on dirt where he raced against top US dirt 3yo
Bernardini. He never took to the surface and struggled from the break, trailing in a distant last.
2007: four-year-old season As a four-year-old in 2007, Dylan Thomas won the
Prix Ganay at
Longchamp in
France, and the
King George VI and Queen Elizabeth Stakes at
Ascot, the latter under
Johnny Murtagh. On 8 September 2007 he became the first two-time winner of the Irish Champion Stakes and rider Kieren Fallon became the first jockey to win the race three times in succession. He crowned this season with a win in the
Prix de l'Arc de Triomphe on soft ground. The victory stood after a half-hour stewards enquiry into interference was caused because Dylan Thomas veered sharply to the right halfway up the home straight, thereby coming across two other runners. Prior to this race, Fallon had described Dylan Thomas as the best horse he had ever ridden. After the Prix de l'Arc de Triomphe, Dylan Thomas was entered in the John Deere
Breeders' Cup Turf, but he did not contend. After he was withdrawn from the
Japan Cup, his last race was the
Hong Kong Vase, in which he finished 7th. Dylan Thomas retired to
Coolmore Stud in Ireland before the end of the year. He raced for Michael Tabor and Susan Magnier, whose husband,
John Magnier, is Coolmore's managing partner. ==Assessment==