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While investigating a murder, suspicions fall on Conan for being too smart so Conan plays dumb for the rest of the day, much to the Detective Boys dismay.
Kogoro is asked to investigate a dog that is being aggressive towards someone. Yet, Conan and Ran suspect she did something to cause the dog's aggression.
Conan continues to investigate while playing dumb, but how does he give a deduction while being kept such a close eye on?