The Search - Nora Roberts

To most people, Fiona Bristow seems to have an idyllic life-a quaint house on an island off Seattle's coast, a thriving dog-training school, and a challenging volunteer job performing canine search and rescues. Not to mention her three intensely loyal Labs. But Fiona got to this point by surviving a nightmare...
Several years ago, Fiona was the only survivor of the Red Scarf serial killer, who shot and killed Fiona's cop fiancé and his K-9 partner.
On Orcas Island, Fiona found the peace and solitude she needed to rebuild her life. But all that changes on the day Simon Doyle barrels up her drive, desperate for her help. He's the reluctant owner of an out-of-control puppy, foisted upon him by his mother. Jaws has eaten through Simon's house, and he's at his wit's end.