World's smallest dog is 9.65-cm-tall
The Guinness World Record for the smallest dog in the world, in terms of height, is held by a 9.65-centimetre tall (3.8 inches) Chihuahua called Milly. Owned by Vanesa Semler from Puerto Rico, the female dog was born in December 2011 and named Miracle Milly. Milly set the record three years ago.