A cartoonist is never in full control of a character. The drawing hand may waver and tremble and zig instead of zag — consistency is a hope, not a rule. And a truly vibrant character will eventually lead the creator, not the other way around. That was always how Peanuts cartoonist Charles Schulz described why Snoopy, his rambunctious invention, evolved between his introduction in 1950 and his final comic-strip appearances in 2000.

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