Shiver by Maggie Stiefvater

Grace has loved her wolf ever since she was attacked by his pack. She watches him all through each winter, and in each Summer she mourns his mysterious disappearance. Although Grace has no idea, this yellow -eyed wolf leads a second life each summer- as a human whose name is Sam. Grace and human Sam meet when Sam is shot by hunters as a wolf and they fall into an undeniable love, but Sam must fight the oncoming cold to stay human and be with Grace.This fantasy is well written, almost poetically romantic, and perfect for people who need a break from vampires.

Maggie Stiefvater's website