Boo Boo is a female chihuahua born in 2006 that holds the Guinness World Record for the world's smallest living dog. She weighed less than an ounce at birth and had to be fed with an eye dropper. After her owner Lana Elswick applied to Guinness and had Boo Boo measured, she gained regional, state, and worldwide publicity through newspaper articles and television appearances. Boo Boo has traveled across the U.S. and to other countries like Italy and Japan, appearing on shows like Regis and Kelly and the Today Show to promote her title as the world's smallest dog.