By: Addison Wylie A tiny gem entering the mainstream circuit is Dogs on the Inside.  The documentary features rescued dogs and prison inmates who look after them.  Massachusetts’ Don’t Throw Us Away program gives both inmates and mistreated pups a second chance, as man and animal identify with each other.  In other words: good luck trying to frown towards this film. Dogs on the Inside is a heartwarming documentary, showing the audience just how easy…