Susy Tucker marks the time her autistic son, Zach, began hugging her again — after a lapse of four years — by the arrival of Clyde, a chocolate Labrador trained behind bars by a convicted killer.

Within three weeks of Clyde's arrival at the Tuckers' home in Colorado Springs, Zach went from petting his dog to wrapping his arms around his mother. It was a stunning moment, one of many to follow. The boy who once grimaced and whined at any skin-to-skin contact had learned the warmth of touching from a dog.

Zach and Clyde's story is one of redemption — of how a rescue dog, a prisoner and a boy

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