A Dog's Purpose is a 2017 American comedy-drama film directed by Lasse Hallström and written by W. Bruce Cameron, Cathryn Michon, Audrey Wells, Maya Forbes and Wally Wolodarsky. It is based on the 2010 novel of the same name by Cameron. It stars Britt Robertson, K. J. Apa, Juliet Rylance, John Ortiz, Kirby Howell-Baptiste, Peggy Lipton, Dennis Quaid and Josh Gad.