Open up your pocket and you can fit the world’s smallest dog in it. Dancer, a long-haired chihuhaua, weighs only 18 ounces and is just about 4.1 inches tall from foot to the top of the shoulder. Since Dancer isn’t one-year-old yet (he turns one on June 8), he can’t claim the title yet. When Dancer was born, he was about the size of a thumb and vets were saying that he wouldn’t make it because he would have serious health problems due to his small stature. Well, Dancer proved everyone wrong and is doing well and his only health problem now is low blood sugar. Good luck Dancer!