Snoopy: Its prototype was the hunting dog the author owned as a child

Snoopy's most recognizable feature is his peanut-shaped head. In fact, Snoopy's prototype was Spike, a hunting dog that author Charles Schulz owned as a child. Although Schulz anthropomorphized Snoopy, Snoopy's inner thoughts were always expressed through dialogue boxes in the comic strip. Charlie Brown and his friends would guess Snoopy's thoughts based on his expressions and actions.