History. Charles M. Schulz modeled Peppermint Patty after a favorite cousin, Patricia Swanson, who served as a regular inspiration for Peanuts. Schulz had also named his earlier character Patty after Swanson, and he coined his well-known phrase "Happiness is a Warm Puppy" during a conversation with her in 1959. Swanson's roommate Elise Gallaway served as the model for Peppermint Patty's best ... More @Wikipedia
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