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Young Mouse

Young Mouse
Sire Godolphin
Grandsire Partisan
Dam Mouse
Damsire Sir David
Sex Mare
Foaled 1826
Country United Kingdom
Colour Bay
Breeder Lord George Cavendish
Owner Lord George Cavendish
Trainer Dixon Boyce
Record 6:3-1-0
Major wins
1000 Guineas (1829)
Match against Xarifa (1829)
Match against Bobadilla (1829)

Young Mouse (1826–1843) was a British Thoroughbred racehorse and broodmare who won the sixteenth running of the classic 1000 Guineas at Newmarket Racecourse in 1829. In a racing career which lasted from May 1829 until July 1830 the filly ran six times and won three races. Young Mouse won the 1000 Guineas on her first competitive appearance and then ran unplaced in the Oaks Stakes before winning two match races at Newmarket in autumn. She was retired from racing after a single, unsuccessful run as a four-year-old. Young Mouse was later exported to France where she had some success as a broodmare.

Young Mouse was a bay mare bred by her owner Lord George Cavendish. Both of Young Mouse's parents were successful racehorses who ran in Cavendish's ownership: her sire Godolphin won the Craven Stakes at Newmarket in 1822, whilst her dam Mouse won several races and finished second to Minuet in the Oaks Stakes in 1815.

Until 1913 there was no requirement for British racehorses to have official names (two-year-olds were allowed to race unnamed until 1946). The filly known in retrospect as Young Mouse was never officially named during her racing career and was usually known by a descriptive title such as "the Mouse filly", "Lord Cavendish's filly" or simply as "Mouse". The name "Young Mouse" was used for the horse during her time as a broodmare.

Young Mouse (identified in the Racing Calendar as Ld G. H. Cavendish's b. f. by Godolphin, out of Mouse) began her racing career at Newmarket's First Spring meeting. On 4 May, the opening day of the meeting, she claimed a 500 guinea prize without having to race, when her opponent, a filly named Tancreda, was withdrawn from a scheduled match over five furlongs. Three days later, the filly was one of four runners for the 1000 Guineas Stakes over the Ditch Mile course. Favouritism for the race was disputed by Mr Payne's filly Pauline who started at odds of 11/8 and Lord Exeter's Green Mantle on 6/4; the presence of these two well-regarded fillies appeared to have frightened away most of the opposition. Young Mouse's odds were not recorded in the Racing Calendar, but the Sporting Magazine gave her odds as 20/1. Ridden by William Arnull, Cavendish's filly created an upset by winning the race by less than a length from Green Mantle, with Pauline finishing in third place after a "true run race". A month after her classic win "Mouse" was moved up in distance for the Oaks Stakes over one and a half miles at Epsom Downs Racecourse. She started the 9/2 second favourite in a field of fourteen fillies but finished unplaced behind Green Mantle.


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