Shelbourne Park on 18 April 1928 winning the Punchestown Stakes. He raced five times during 1928, winning four times and equalled the 500 metres world record after recording 28.80 at Shelbourne. The day after competing in the Abercorn Cup final he suffered a serious illness and was diagnosed with distemper. He nearly died but was nursed back to health by the Shelbourne Park veterinary surgeon Arthur 'Doc' Callanan. 1929 He reached the Easter Cup final at Shelbourne and won the Spring Cup final at Harold's Cross Stadium and National Cup final at Shelbourne before travelling to England for the first time. In a solo trial prior to the 1929 English Greyhound Derby on 25 July, Mick broke the track record, reducing his odds from an initial 25–1 to becoming the 4–7 favorite to win by the time of the final, despite still being new off the board from Ireland. He was housed at the kennels of Paddy McEllistrim for the duration of the Derby. In the first round, Mick pulled away down the back straight, beating Captured Half by eight lengths and setting a time of 29.82, a new world record over that length. Father Browne sold Mick for £800, plus any prize money that the dog would win on the night, which at the time was more than the cost of buying a house in nearby Shepherd's Bush. By 8:45pm, when the final took place, some 40,000 spectators were in the ground. The lineup was four dogs; in trap one was Beadsman at 20–1; trap two was Palatinus at 3–1; trap three was Entomb at 9–2, and finally Mick the Miller in trap four, wearing the black jacket. Palatinus made the best start, at the first bend both Mick and Entomb attempted to move inside to the rail, but Beadsman collided with both of them, sending all three dogs sprawling. The no–race klaxon went off, and the race had to be restarted. None of the dogs was allowed to leave the track with until the race was re–run at 9:15pm, the only comfort given to Mick on a particularly hot summer's evening was a handkerchief soaked in cold water. The re–run began, with Palatinus again getting away first, however at the first corner, Mick pursued him around the first corner alone. Catching him down the back straight, Mick pulled away around the third bend going on to beat him