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Belle is Snoopy's sister. She lives in Kansas City, Missouri with her unnamed teenage son whom Snoopy noted as resembling the Pink Panther. Belle herself looks like her brother, but with longer eyelashes. In addition she wears a lace collar.
In the comic strip, Peanuts by Charles M. Schulz, Snoopy was often stated to have seven siblings. Andy, Marbles, Olaf, Spike and Belle. And Molly and Rover although they are of little importance. In the June 6, 1959 comic strip, following the birth of Charlie Brown's sister Sally, Snoopy remarks that he has no brothers or sisters, and is an "only dog." However, in a March 18, 1971 strip, Snoopy writes in his autobiography: "I was born one bright Spring morning at the Daisy Hill Puppy Farm. I was one of eight puppies."
Their mother is called Missy, but has appeared only once in Peanuts, on July 26, 1996.
Like Spike, Belle also plays the violin.
Belle only made a few appearances in the strip, but is well-remembered because of the Belle stuffed animal toys sold in the late 1970s and early 1980s. Many people who were not regular readers of the comic strip mistakenly thought that she was Snoopy's girlfriend, rather than his sister. In Snoopy's World War I fantasies, Belle is a nurse, not a soldier.