Kate Mara discusses her passion for animal rights activism ahead of the release of her Marine movie "Megan Leavey." Based on a true story, Mara plays a corporal and K-9 dog handler who bonds during combat with her canine partner and fights to bring him home. (June 9) Media: Associated Press NEW YORK (AP) ? Kate Mara says it was a thrill to work with the dogs on the set of her new Marine movie, "Megan Leavey.