Bolivar is a non-anthropomorphic St. Bernard dog belonging to Donald Duck. He first appeared in the Mickey Mouse cartoon Alpine Climbers where he and Pluto rescued Mickey and Donald from an eagle and a mountain goat. Bolivar is unusual for a Disney character in that he is not anthropomorphized beyond showing an unusually broad range of facial expressions; he is actually represented with the characteristics of his species. He also appeared in the Silly Symphonies cartoon More Kittens.
Later on he appeared in the newspaper comic strips as Donald's dog. Ever since 1938, Bolivar has been a prominent member of the Duck family. He has even been used by Carl Barksas a companion for Huey Dewey and Louie, and appears now and then in recent stories (the artist Daniel Branca had Bolivar as one of his favourite characters).
In some comic strips Bolivar had a son named Behemoth, who disappeared without a trace later on.
Bolivar has also been called Bornworthy and Bernie, as his name is rather controversial for being a Disney character (see Simón Bolívar). Nevertheless from 1992 onward the original name Bolivar has almost always been used in the United States.