Boo Boo was the world's smallest dog from 2007 to 2013.
She stood at a height of 9.65 cm (3.80 in), according to the Guinness Book of World Records.
[1][2] Boo Boo was replaced by Milly,[2] another Chihuahua, as the World's Smallest Dog.
Other contenders for the record included Beyoncé,[3][4] a Dachshund-Chihuahua mix, and Scooter, a Maltese.
[5][6] This dog-related article is a stub.