KissMeImAWriter
Skinwalkers are the cousins of werewolves. They turn into dogs whenever they prefer rather than a killing machine every full moon.
Skinwalkers must find a family and gain its trust to survive. And once there is mutual trust, the Skinwalker must bite each family member and convert them into Skinwalkers as well to keep the species alive.
Iris is a Skinwalker, and she's living with the Lincoln family. But when it comes time to convert them, Iris is unable. She loves them too much to betray them. So she runs away. Away from them, from the Skinwalkers.
She does, however, go to school with one of the family members. Max. Just because she wants to make sure he and his family are safe. Not because she's in love with him...well a little because of that reason.
When they become closer and he develops feelings for her too, the other Skinwalkers find her scent. It's either be killed, kill, or watch as the family she loves gets ripped to shreds...leaving her alone.