How long is the dog's shadow if a 6-foot tall scarecrow in a farmers field casts a shadow that is 21 feet long and a dog standing next to the scarecrow is 2 feet tall?

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How long is the dog's shadow if a 6-foot tall scarecrow in a farmers field casts a shadow that is 21 feet long and a dog standing next to the scarecrow is 2 feet tall?