They do well together, though, and he actually saves her life. Based on a true story, the film follows Marine Megan Leavey (Kate Mara) and her combat dog, Rex. The two go through hell together in Iraq, and after she is sent home, she takes on a difficult fight to keep him from being euthanized.The trailer showcases their special relationship — Megan is a woman who doesn’t connect well with others, and Rex is known for being particularly aggressive. Posted March 15, 2017 by Stephanie Topacio LongPrepare to feel your heartstrings not just tugged but yanked.Bleecker Street has unveiled the official trailer for the upcoming drama “Megan Leavey,” and if it doesn’t make you feel anything, you might just be dead inside. Beyond that, though, the marine credits her dog with teaching her what love is.Get the full emotional impact below, and don’t say we didn’t warn you if you get teary.”Megan Leavey” opens June 9.