Mr Dinos is a bay horse with a small white star bred in Ireland by the County Tipperary-based Mocklerstown House Stud.
[3] Throughout his racing career Mr Dinos was owned by the Cypriot businessman Constantinos Shiacolas[4] and trained by Cole at the Whatcombe Estate near Wantage in Oxfordshire.
[5] Mr Dinos's dam Spear Dance was an unraced mare who produced several other winners including Risk Material who won the Derrinstown Stud Derby Trial in 1998.
[8] After an absence of eight months Mr Dinos returned in an eleven furlong maiden at Kempton Park Racecourse on 1 April in which he started favourite but finished third behind Mawaheb and Dileer, beaten three and a half lengths by the winner.
He recorded his first success two weeks later in a maiden over one and a half miles at Newmarket Racecourse, taking the lead three furlongs out and winning by four lengths from the Barry Hills-trained Lakatoi.
[10] At Royal Ascot on 21 June Mr Dinos was moved up in class and distance to contest the Group Three Queen's Vase over two miles and started second favourite behind the Irish challenger Black Sam Bellamy.
Eight days after his run at Ascot, the colt was matched against older horses in the Northumberland Plate a handicap race over one and three quarter miles at Newcastle Racecourse.
He took the lead after a quarter mile and led the field until the final turn but faded in the closing stages and finished fifth behind Bollin Eric, Highest, Bandari and Mamool.
[13] On 27 October the colt returned to France for the Group One Prix Royal-Oak over 3100 metres at Longchamp Racecourse in which he was ridden by the French jockey Dominique Boeuf.
[13] Mr Dinos began his third campaign in the Group Two Henry II Stakes over two miles at Sandown Park Racecourse on 26 May in which he was ridden by Frankie Dettori.
He started 6/1 second favourite behind the Doncaster Cup winner Boreas with the other runners including Persian Punch, Bangalore and Hugs Dancer (Ebor Handicap).
After racing in third place he took the lead approaching the final furlong and drew away in the closing stages to win by two and a half lengths and a neck from Pole Star and Kasthari.
The build-up to the race was exceptionally difficult for Paul Cole as seventy percent of the horses at Whatcombe were affected by a viral infection and Mr Dinos had to be kept in isolation, attended only by his stable lad Tom Pirie.
Black Sam Bellamy, Pole Star, Kasthari and Persian Punch were again in the field whilst the other runners were Fight Your Corner (Chester Vase), Tholjanah (Noel Murless Stakes), Jardines Lookout (Goodwood Cup), Savannah Bay (Prix de Lutèce), Pugin (runner-up in the Irish St Leger) and Alcazar.
[22] In the Gold Cup at Ascot on 17 June Mr Dinos, with Fallon in the saddle, started 5/4 favourite ahead of Papineau, Westerner, Brian Boru and Royal Rebel.
After tracking the leaders Fallon sent the favourite into the lead three furlongs out, but Mr Dinos faded in the straight and finished sixth of the thirteen runners behind Papineau.
After an absence of a year he started a 20/1 outsider for the 2005 "Ascot" Gold Cup which was run at York and never looked likely to win, finishing eighth behind Westerner.