You Only Live Once, David Bravo [Oshiro, Mark]

Middle school is the worst, especially for David Bravo. He doesn't have a single class with his best (okay, only) friend, Antoine. He has to give a class presentation about his heritage, but he's not sure how--or even if--he wants to explain to his new classmates that he's adopted. After he injures Antoine in an accident at cross-country practice, he just wishes he could do it all over.

He doesn't expect his wish to summon a talking, shapeshifting, annoying dog, Fea, who claims that a choice in David's past actually did put him on the wrong timeline... and she can take him back to fix it.

But when their first try (and the second, and the third) is a total disaster, David and Fea are left scrambling through timeline after timeline--on a quest that may lead them to answers in the most unexpected places.