From Buicks bridge car park their is a 4WD track (4.24km ) running to the bace of dog hill , next to the south branch of the Ashburton river.from there it's a easy clime up onto the dog hill 59G 509287E 5176631S the easiest way from there is turn right to 59G 509257E 5176674s , just keep to the ridges to the highest point on the dog 1169m where you descend to the saddle /4wd track and continue to the hut.