Graham,
It's a very long shot as only about 2% have survived but "Forces War Records" have transcribed the remaining Hospital Admission and Discharge books, whether the project is finished or not I do not know.
You could also try the archives of the local, to where he lived at the time, newspapers.
222 men from the 2/9th Bn arrived at Gallipoli as reinforcements for the 1/9th Bn on 23.07.1915 which, I think it is safe to say, included Pte Dolan.
Charlie