Young Mouse

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of the meeting, she claimed a 500 guinea prize without having to race, when her opponent, a filly named Tancreda, was withdrawn from a scheduled match over five furlongs.[5] Three days later, the filly was one of four runners for the 1000 Guineas Stakes over the Ditch Mile course.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.[6] 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".[6] 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.[7]

Young Mouse did not race again until autumn when she appeared on the second day of the Newmarket "First October" meeting, which actually took place on 29 September. Ridden by Arnull she contested a match race against Mr Greville's filly Xarifa in which she carried twelve pounds more than her rival. "Mouse" won the five furlong race by a head after a "severe struggle"[8] to claim a prize of 200 guineas.[9] Another success in a 200 guinea match race followed at the Second October meeting when she beat the four-year-old Bobadilla (who had been favoured in the betting) over the Ditch Mile course.[10] According to the Sporting Magazine "Mouse" led all the way and won "hard held" by her jockey Patrick Conolly.[11] On 31 October, the last day of the Newmarket season Young Mouse was beaten in a ten furlong match by Lucetta, a filly who went on to win the Ascot Gold Cup in 1830.[12]

Young Mouse (still officially unnamed), stayed in training as a four-year-old, but did not race until the July meeting at Newmarket. On the second day of the meeting she was assigned a weight of 114 pounds in a handicap race over a distance of one and three quarter miles. She was not among the favourites and finished unplaced behind Tranby, a colt owned by John Gully. Young Mouse never raced again.