Claire de Lune by Christine Johnson

Torn between two destinies?

Claire is having the perfect sixteenth birthday. Her pool party is a big success, and gorgeous Matthew keeps chatting and flirting with her as if she’s the only girl there. But that night, she discovers something that takes away all sense of normalcy: she’s a werewolf.

As Claire is initiated into the pack of female werewolves, she must deal not only with her changing identity, but also with a rogue werewolf who is putting everyone she knows in danger. Claire’s new life threatens her blossoming romance with Matthew, whose father is leading the werewolf hunt. Now burdened with a dark secret and pushing the boundaries of forbidden love, Claire is struggling to feel comfortable in either skin. With her lupine loyalty at odds with her human heart, she will make a choice that will change her forever? –Amazon.com

Shiver by Maggie Stiefvater

For years, Grace has watched the wolves in the woods behind her house. One yellow-eyed wolf—her wolf—is a chilling presence she can’t seem to live without. Meanwhile, Sam has lived two lives: In winter, the frozen woods, the protection of the pack, and the silent company of a fearless girl. In summer, a few precious months of being human … until the cold makes him shift back again.
Now, Grace meets a yellow-eyed boy whose familiarity takes her breath away. It’s her wolf. It has to be. But as winter nears, Sam must fight to stay human–or risk losing himself, and Grace, forever.–Goodreads

Linger by Maggie Stiefvater

A summary is available on Goodreads for those wanting to know. :)