"The Hand That Feeds..." - eviltoast

For those who might not yet know: if you feed a dog enough times (meat, poultry, fruit, they aren’t exactly picky) they will lead you to a buried treasure chest. This works once per dog, and the chests literally do not exist before the dog decides to show you the way, so making a furry litlle friend is the only way to get these treasures.

This has already been in Breath of the Wild by the way. ;)