Wooden Statue

This wooden statue is a statue Ilia was given as a child. After you give the CastleTown doctor Telma's Invoice, he tells you she had a statue. The idol was then stolen. After that, he'll tell you to go away. After that, transform into a wolf. The scent of the medicine is behind a block. Follow the scent to Telma's cat. The cat will tell you a gang of "tough" Stalboars on the south side of town stole it. Defeating the Stalboars gives you the Statue.

Now you must return to Kakariko Village and show the wooden statue to Llia. The Gorons will take notice and offer to help because they know where it came from. Follow your map to the northwest portion of Hyrule field to meet with Darbus inside a cave. Using his might, he’ll burst through the boulder blocking the away, permitting access to the Hidden Village.

As a reward, you recieve the horse whistle. now you can call Epona (or whatever the heck you named the horse) at any time. Note does note always work. You can't ride your horse everywhere.

Off topic but, In case you haven't noticed, Epona's Song is the same in Ocarina of Time.