A Man About a Dog is a 1947 thriller novel by the British-Australian writer Alec Coppel.

[1] Driven to distraction by his wife's repeated affairs, her husband decides to kidnap her latest lover and commit the perfect murder, only to be thwarted by a dog.

In 1949 it was adapted into the British film Obsession directed by Edward Dmytryk and starring Robert Newton, Sally Gray and Naunton Wayne.

[2] Alec Coppel originally wrote the story as a play when he was living in Sydney during World War II.

The play opened in London in April 1946[4] and the novel was published in 1948, although many critics commented that the novel felt similar to a play.