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Smallest dog. In terms of height, the smallest living dog is Boo Boo, a long-haired female Chihuahua who proves that good things come in small packages. Boo Boo is just 4 inches tall and weighs in at a mere 2 pounds. She lives in Raceland, Ky., with her owner, Lana Elswick.
Tiny Chihuahua Milly is the worldâs smallest dog at just 3.8 inches high. 1  Micro Mutt weighs was born in December 2011 but has failed to grow any larger than an average Chihuahua puppy. 2  She replaces former record holder Boo Boo from Kentucky in the U.S. who towers over her at 4.2 inches.