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.

 

You'll get a sense of the dog's true size through this adorable video of Boo Boo.