Vlad the Drac by Ann Jungman
Paul and Judy are on a very boring sight-seeing coach holiday in Romania when they discover a baby vampire living under a stone. They wonder if he is the last of his kind. They smuggle him home to England, disguised as a souvenir. However, the trouble starts as soon as they reach home. This tiny little vampire cooks up huge amounts of hilarious trouble for the poor children. Will they be able to keep him a secret?