This is a terrific movie about Megan Leavey, a young Marine corporal whose bond with a military combat dog saved many lives during her deployment in Iraq. Assigned to clean up the poop in the K-9 unit after getting into trouble, Leavey starts to identify with Rex, a particularly aggressive dog that she trains. Over the course of their service, Megan and Rex complete more than 100 missions until an improvised explosive device injures both, putting their fates in jeopardy.
Heather White saw the movie and highly recommends it. Spoiler--just so you dog-lovers will go see it--the dog survives his deployment.