A dog's way home by W. Bruce Cameron

When Lucas Ray rescued his puppy Bella he knew his life would change forever.  Smuggling her into his building isn't easy, particularly with his prying neighbours.  Lucas decides to risk taking her to work.  The joy on the faces of the veterans in his hospital as Bella distributes her unique brand of comfort makes it all worth it.

This was a special book I bought which lead me to become part of the Therapy Dogs South Africa with my absolute perfection of a pug, Pepper!  A must read.