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A Louisiana dog's 5-inch tongue has been officially certified as the longest in the world by Guinness World Records. Zoey, a Labrador/German shepherd mix, was awarded the top honor for the longest tongue on a living dog. Her owners said they got Zoey when she was only 6 weeks old, and they almost immediately noticed her unusually long tongue. "We thought surely she'd grow into it, but she obviously didn't. She still has an enormous tongue compared to her body," Sadie Williams told Guinness World Records.