Before passing away from illness, Niuniu and her mother Lin Wan made a promise that in her next life she would turn into a little dog and return to her mom's side. She truly reincarnates as a little golden retriever, but is stolen from her dog mom by a dog thief. From then on, Niuniu embarks on a long journey to find her mother, along the way meeting kind Grandma Sun and her dog friend Da Biaoge, staging a touching story of a dog searching for her family.