Spell Hound by Lindsay Buroker

Since Morgen Keller arrived in the small town of Bellrock, she’s learned that magic is real, fought battles with werewolves, and managed to turn the local witches into enemies. As an introverted database programmer, she’s not equipped to handle any of this.
Fortunately, she has an ally: the fearsome werewolf Amar.
Unfortunately, one of the witches branded him and can take control of him whenever she wishes.
To have a chance of freeing her werewolf ally, Morgen must learn to harness the power she inherited from her grandmother. She may also have to find a familiar, confront a powerful witch, and admit that she has feelings for Amar. What could go wrong?