感动了Manny一所新的学校，不容易适应。希望他有更多的朋友后，Manny发现了一个神秘的衣领，把它放在鲁弗斯家里的狗。突然鲁弗斯变成了一个男孩！ Manny's not sure what to do, so he enrolls Rufus in school. When the other students notice Rufus's silly dog antics -- chasing squirrels, eating without utensils, asking for belly rubs, and catching a soccer ball with his mouth -- he immediately becomes the most popular kid around. Manny is jealous of his new best friend but eventually learns that a dog's loyalty to his owner always comes first.