Five years later, many Americans still find it hard to face the assault on humanity that took place Sept. 11, 2001. In Nona Kilgore Bauer's impressive book "Dog Heroes of September 11th, A Tribute to America's Search and Rescue Dogs," the author introduces more than 75 highly trained dogs from across the country who helped bring closure to families affected by the terrorist attacks. Interviews with owners reveal that, for many dogs, a reward for a rescue can be a spirited game of tug. Yet with fewer than two dozen survivors found and more than 2,000 killed, the dogs who...