Byrne produced a superb ride on Divine Unicorn for Dunn to win the Group Three Tattersall's Cup last Saturday.
A week later he rides the Dunn-trained Miss Dubois in the Listed Caloundra Cup (2400m).
As is the case with many trainers Dunn is keeping a close watch on the weather for Saturday's meeting which is likely to be run on a heavy track.
Dunn has always had a high opinion of Miss Dubois.
“Jim rode her when fifth in the Ipswich Cup and he was happy to stay with her.”
A product of Trelawney Stud in New Zealand Miss Dubois is a daughter of noted staying sire High Chaparral.
“She is rising eight but did her early racing in Victoria and I have always thought she could win another good race,” Dunn said.