Domidak and Prissen found a cave full of chests that all contain a single green rupee, but they know one of the chests contains a treasure.
Starting the Quest
Talk to Domidak and Prissen next to Cephla Lake Cave to start the quest.
How to Complete the Quest
You can drop meat on the ground near the dog, and the dog will eat it, becoming friendly to you. It may follow you, but after a while, it will become bored and go back to the tent. If this happens, it means that you have not fed it enough meat. Stay near the dog and keep feeding it meat (it may take a while) until the dog leads the way into the cave. Follow it and it will sit down on the ground next to the chest that contains the treasure. Use Ultrahand to pull it upward, and the dog will run out of the way.
Quest Reward
The correct chest contains the Ember Trousers. During the cutscene that follows, a bottle is also found. Examine the bottle to start the quest Misko's Treasure: The Fierce Deity.