Mr. Jack was an American comic strip by Jimmy Swinnerton which ran in William Randolph Hearst newspapers from August 30, 1903 until 1935. He may be the first developed "funny animal" character, a type that has since become a staple in the comics medium. The character of Mr. Jack, a philandering playboy tiger, emerged in Swinnerton's Hearst feature, The Little Tigers, which began on February 20, 1898. Mr. Jack first appeared on May 17, 1903, and took over the strip; soon, the title of the feature changed to Mr. Jack.