"A Dog's Purpose" May Be Inspired By Grief, But Brings Us Hope

The highly anticipated A Dog's Purpose, based on the best-selling book by the same name, hits theaters next week so stock up on your tissues — this one's a tear-jerker.

Seriously, even the trailer will get the water works going.

While the movie looks pretty phenomenal, the book it's based on is incredible, earning five stars with over three thousand reviews on Amazon.com.

For anyone who has loved and lost a dog, A Dog's Purpose: A Novel for Humans is a powerful read. The story line is sure to tug the heartstrings of dog lovers everywhere: Every dog has a reason for their existence — even reincarnating until they figure out what their purpose is.

But what inspired the novel, written back in 2011, that spent 52 weeks on the New York Time's Best Seller List?

In an interview with Inside Edition, author Bruce Cameron reveals that he was inspired to write A Dog's Purpose when his girlfriend, Cathryn Michon, lost her dog. Absolutely distressed when her dog Ellie passed away, Michon vowed never to adopt another.

"It was the first dog she ever had, so she was completely unprepared the way the grief overwhelms you," said Cameron.

So, to help her come to terms with her grief, he decided to tell her a story "about a dog that reincarnates, and remembers each life and eventually comes to conclude that there must be a reason, a purpose it keeps being born."

The story became a best-selling novel — still on the top 100 list for Amazon.com — and now a major motion picture. Cameron and Michon, married now, co-wrote the screenplay. And as for whether it worked to assuage Michon's grief, well, the couple adopted their dog, Tucker, seven years ago, saving him from euthanization.

Watch some behind the scenes footage of the film:

Or participate in a quiz to determine which dog you are most like!

Be sure to get your tickets and go see the movie in theaters beginning January 27.