Lulu was a real military dog. She was a Labrador Retriever and a member of the Central Intelligence Agency's (CIA) K9 explosive detection program. The CIA occasionally releases information about their working dogs for security purposes, and Lulu gained some media attention in 2017.
However, the information available about Lulu is limited, and her specific activities and contributions to the CIA's operations are not publicly disclosed due to the sensitive nature of their work.