By: Nick Ferwerda A Dogs Purpose tries to demonstrate how strong a bond between man and man’s friend can truly be.  It’s also about a dog (voiced by Josh Gad) finding what its life purpose is over the course of multiple lives and many different experiences.  It’s odd how five screenwriters (including W. Bruce Cameron – the author of the best-selling book this film is based on) have failed to authenticate characters or emotion – it’s all a…