A Dog's Will is a 2000 Brazilian fantasy comedy film directed by Guel Arraes, who co-wrote the screenplay with Adriana Falcão and João Falcão. It is based on a similarly named play by Ariano Suassuna, with elements of some other of Suassuna's plays, The Ghost and the Sow and Torture of a Heart. The film stars Matheus Nachtergaele, Selton Mello and Fernanda Montenegro, with Rogério Cardoso, Denise Fraga, Diogo Vilela, Marco Nanini, Lima Duarte and Luís Melo in supporting roles.