Guinness World Records shared video footage of a playdate between the world's tallest and world's shortest dog! 7-year-old great Dane Reginald met 4-year-old chihuahua Pearl in Idaho for the first time. Reginald is three feet, three inches tall, while Pearl stands at just 3.59 inches. "I'm not worried that [Reggie] won't be careful around Pearl. He's very, very cautious and aware," Sam, Reginald's owner, said. "When Pearl meets bigger dogs, she is really friendly. I think she has no idea she is a small dog," Vanessa Semler said of her pup. The odd pairing seemed to hit it off! (UPI)