Meet Niall Harbison, the author determined to save street dogs

Niall Harbison traveled to Thailand for his mental health. While there, he started helping stray dogs he saw on the streets. It became his life's mission to help stray dogs everywhere. He's written a book about his experience, "Tina: The Dog Who Changed the World."

By Niall Harbison

Reprinted with permission of the publisher, HarperElement. All rights reserved.