what did the smallest adult chihuahua weigh
By height and by weight. 1  Who could doubt that Chihuahua dogs, a race that has its origins in the north of Mexico, are the world's smallest pooches? The problem is now that there is a fierce competition on deciding upon the world's smallest Chihuahua/dog. At one and a half year old, Boo Boo, a long coated Chihuahua, of just 4 inches (10 cm) tall and a weight of 1.5 pounds (675 g) has been crowned the new smallest living dog in the world by height by the Guinness Book of World Records.