A Dog's Life (1918) is a silent film written, produced and directed by Charlie Chaplin. This was Chaplin's first film for First National Films.

Chaplin plays opposite an animal as "co-star". "Scraps" (the dog) was the hero in this film, as he helps Charlie and Edna toward a better life. Edna Purviance plays a dance hall singer and Charlie Chaplin, The Tramp. Sydney Chaplin (Chaplin's brother) had a small role in this film; this was the first time the two brothers were on screen together.

Charles Lapworth, a former newspaper editor who had met Chaplin when he interviewed him, took a role as a consultant on the film.

Other films where dogs appeared on screen with Chaplin were The Champion (1915), The Gold Rush (1925), City Lights (1931) and Modern Times (1936).