The impressive Gotta Go Cullect 5yr-old has had few favours since resuming his career this season, racing top-liners such as Locharburn and Alta Ronaldo, but has now won four races in just over three months.
Not bad for a horse who looked done and dusted after winning as a 3yr-old on the Marlborough circuit in January 2014.''
He won a race as a 3yr-old then we had to put him aside because everything went wrong with him,'' Dunn said.''
We thought he was finished for good. But he's come back and held his form, so we're very lucky.''
Dunn looks after the South Island team for his training father, Robert, and had been used to allowing Cullect A Guinness to set a strong tempo in front.
However, after grabbing the lead early, Dunn jogged them along in the early stages and was surprised to get little pressure from the back.
The mile rate for the 3000m pace was a leisurely 2.12.2, but the last 800m would be considered fast on an all-weather circuit, let alone the grass at Oamaru on Saturday.
Cullect A Guinness ran the last 800m in 56sec flat, and the last 400m of 26.4sec was incredibly quick for a grass track.
''In the past, he's got the front and run them along quite hard,'' Dunn said.
''But he's got a bit of speed as well, so I might have to try and use that.
''He jumped up the grades bang, bang, bang, and raced the good ones on Cup day so overall his form is pretty solid.''
Dunn is likely to bypass the West Coast circuit with the 5yr-old.
''I probably won't take him to Westport. I don't know if he would travel over there that good so I might stick around home with him,'' he said.
''He's had his fair share of niggling problems, so as long as he pulls up good and we keep monitoring him, he'll be good.''
A summer target for BK Dawn is also up in the air after her win on debut in the 2000m maiden trot.
''There's lots of options over the summer; we'll see how she pulls up now,'' co-trainer and driver Philippa Wakelin said.
''The owner [Ian Starkey of Cust in North Canterbury] is in no hurry so we'll pick and choose where she goes.''
Patience is often a necessary virtue with trotters - and particularly ones with Armbro Invasion blood in the pedigree.
''Being out of an Armbro Invasion mare, she'll take longer at the other end,'' Wakelin said.
''She was a little bit pacey earlier on at the workouts. But just with a bit of time, and strengthening, she's come to it really nice and I like her a lot.''
