Man's Best Friend is a 1935 feature film about the adventures of a boy and his dog Lightning. The film stars Douglas Haig, an American child actor of the 1920s and 1930s; Lightning, a grandson of Strongheart; Frank Brownlee; and Mary McLaren.Man's Best Friend was the high point of Douglas Haig's career as a film actor. In 1986, TV Guide described the film as a "simple, unpretentious story of a little mountain boy and his pet police dog".Man's Best Friend has been released on DVD, together with The Secret Code.