Pre-Owned Hidden (Hardcover) by Kelley Armstrong

Werewolves Elena Michaels and Clayton Danvers want to give their four-year-old twins, Kate and Logan, something their parents never had: a nice, normal holiday. No Pack responsibilities, no homicidal half-demons or power-hungry sorcerers to deal with just the four of them, alone, at a chalet outside Ontario's Algonquin Park. Then a strange werewolf shows up at their door while the town is buzzing about a young man, back from college, found half-eaten in the woods. And there's the missing little girl

With all the signs pointing to a rogue mutt with a taste for human flesh, Elena and Clay have no choice but to investigate. But are they the hunters or the hunted?