what is the smallest dog
Tiny Chihuahua Milly is the worldâs 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.