Billie began her career in the Border Force breeding program in 2016. She transferred to the Holsworthy school as an Explosive Detection Dog (EDD) at around 1–2 years of age, undertaking formal training across 2018–2019. In 2021, Billie was assigned to a handler and continued to train and work operationally as an EDD in Sydney. In 2024, she was posted to 2nd Combat Engineer Regiment (2CER) at Enoggera, QLD. After a dedicated career spanning nearly a decade, Billie has now retired at almost 10 years old.