The Puddleman — Raymond Briggs

Tom refers to his grandfather as "Collar" because he drags him around on a lead. One day Tom decides that he will take Collar on a walk to see the puddles he named after the members of the family, but the puddles are not there. Collar insists that this is because it hasn t rained, but Tom believes that it s just because they haven t been put in yet. He wanders off, leaving Collar talking to Mrs. Whitebobblehat, and comes across just the person he needs. Finally, with puddles restored to their full, family-resembling glory, Tom and Collar go home for tea."