Olive, the Other Reindeer, has been around for a number of years now but there may be someone reading this who isn't familiar with the story.  (Besides the book, there is a DVD, a pop up book, an advent calendar and who knows what else available) 

Although the book is a children's book, I love the story and all adults I know who have read the story love it.

Olive is a dog.  One day around Christmas time, while Olive was on her daily walk,  she heard the Christmas carol "All of the other reindeer"... But what Olive heard was "Olive, the other reindeer".. Olive is surprised to learn that she is a reindeer because she thought she was a dog.  Undertanding that Santa needs her, Olive sets out for the North Pole and Santa's workshop.

Very entertaining.  Will put you in a good mood!

http://www.amazon.com/Olive-Other-Reindeer-Vivian-Walsh/dp/0811818071/ref=ed_oe_h