"Brilliant and unflinching." —Peter Zheutlin, New York Times bestselling author of Rescue Road and RescuedWhen journalist Rory Kress met Izzie, she didn't think twice about bringing her home. She found the twelve-week-old wheaten terrier in a pet shop and was handed paperwork showing Izzie had been born in a USDA-licensed breeding facility—so she couldn't be a puppy mill dog, right?But a few years later, as Rory embarked on her own difficult journey to become a mother, her curiosity began to tug at her. Sure, Izzie was her fur baby, but who was her dog's real mother, and where was she now? And where did Izzie pick up her strange personality quirks? Like so many people, Rory had assumed the young puppy was a clean slate when she bought her. Those questions led Rory—with Izzie by her side—on a nationwide investigation, the first of its kind. From a dog livestock auction to the laboratory of one of the world's leading animal behavioral scientists all the way up to the highest echelons of