Showing Bad Moon Rising by Sherrilyn Kenyon

Fang Kattalakis isn't just a wolf. He is the brother of two of the most powerful members of the Omegrion: the ruling council that enforces the laws of the Were-Hunters. And when war erupts among the lycanthropes, sides must be chosen. Enemies are forced into shaky alliances.

When Aimee, the woman Fang loves, is accused of betraying her people, her only hope is that Fang believes in her. Yet in order to save her, Fang must break the law of his people and the faith of his brothers. That breech could very well spell the end of both their races and change their world forever.

The war is on and time is running out...