The puppy Koro rushes out of the house chasing Sawako leaving for school, but Koro gets lost. In unfamiliar places, Koro is nearly run over by a car, threatened by an alley cat... For little Koro, everything he encounters outside is new and a big adventure. Meanwhile, Sawako comes home to learn that Koro is gone. She frantically tries to find him.
Source: Ghibli Museum