Postman Pat's Disappearing Dotty (S03E18)

Julian has taken on the responsibility of caring for the school's guinea pig, Dotty. However, on her very first night at the Clifton home, she manages to make a break for it. The next morning, the whole family is on a mission to find Dotty. Meanwhile, as Pat heads off to work, it becomes clear that Dotty has decided to tag along on his errands...