The two-year-old dog, owned and trained by Tina Robinson at Greenmill, Longtown, powered ahead to win by almost three lengths.
He finished ahead of another 5/2 shot, Sam’s Girl, trained at the Hume kennels at Hawick.
Gretna regular Dexter Clark produced a winning double with his entries over the sprint and middle distances.
His three-year-old dog Magnet took the honours on the 280 metres trip finishing 2.5 lengths in front of Billy Blister, a two-year-old dog from Davy Dunbar of Auchinleck.
Clark produced an equally impressive victory over 470 metres with 2/1 shot Pip winning by 4.5 lengths from Smack, a 5/4 fancy from retired Scots engineering firm boss Willie Hyslop.
RESULTS and STARTING PRICES
First race (7.30) – 1, Dun Dolly, trap 1, price 1/2 fav.; 2, Ballydoyle, 4, 5/2; distance 3.25 lengths; winning time 17.27 seconds.
Second (7.45) – 1, Mo’s Muchara, 1, evens/fav.; 2, Droop, 4, 5/4; 3; 17.65.
Third (8.00) – 1, Real Fun, 3, 5/4; 2, Rap, 6, 5/4; 6; 17.14.
Fourth (8.15) – 1, Juke Box, 5, 7/4; 2, Wiggy’s Sky, 2, 5/2; .5; 17.50.
Fifth (8.30) – 1, Magnet, 2, 2/1; 2, Billy Blister, 4, 2/1; 2.5; 17.17.
Sixth (8.45) – 1, Rapture, 6, 2/1; 2, Fanta, 4, 2/1; 1.5; 17.26.
Seventh (9.00) – 1, Pip, 3, 2/1; 2, Smack, 6, 5/4; 4.5; 29.43.
Eighth (9.15) – 1, Danny Boy, 5, 5/2; 2, Sam’s Girl, 3, 5/2; 2.75; 29.67.
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