Year of the Dog (2007)
Year of the Dog is a 2007 comedy-drama film written and directed by Mike White, and starring Molly Shannon, Laura Dern, Regina King, Tom McCarthy, Josh Pais, John C. Reilly and Peter Sarsgaard. The film describes the process of a woman that goes from having one pet dog at home to becoming a vegan and an animal rights activist.
More at Wikipedia.