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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.
1 Sylvia, a matchbox-sized Yorkshire Terrier owned by Arthur Marples of Blackburn, England, was the smallest dog in recorded history. 2  The dog died in 1945 when she was two years old, at which point she stood 2.5 inches tall at the shoulder, measured 3.5 inches from nose tip to tail, and weighed 4 ounces.