Snoopy is a spotted white beagle with a rich fantasy life. The pet dog of the hapless Peanuts character Charlie Brown, Snoopy became one of the most iconic and beloved characters in the history of comics. Although Charlie Brown was ostensibly the main character in Charles Schulz’s long-running strip, more often than not his dog stole the show. The strip began in 1950, and, before that decade was over, Snoopy had begun walking on two feet and communicating with readers through cartoon “thought bubbles.” Although the other characters in the strip were not privy to Snoopy’s thoughts, they often spoke to him as if he were human and even made him a star player on their baseball team.

Source: Encyclopedia Britannica