Genta

Rin and Mimi's female dog who lives at their office. ~! As an immortal, she does not age throughout the series and survives being shot on multiple occasions without any visible lasting injuries. Mimi takes her with her after the Asōgi Consulting office is demolished in episode four. Genta is killed in episode five, leaving only ashes behind, just like human immortals whose time spores are removed.!~ (source: Wikipedia)