杰克一家又帶著雪莉回來了!!孩子們偷偷溜走就是要讓雪莉可以參加舉世聞名的國際狗狗賽跑大事，但卻意外掉入了韋瑟太太設下的陷阱!這次代表美國的冠軍狗狗—雪莉是否能如願拿下世界冠軍呢?

　　Siren Phillips has lived her life thinking she's an ordinary girl, in an ordinary town. On the eve of her twelfth birthday, however, she learns that