Teacup-size puppy breeds include Pomeranian, Yorkshire, Chihuahua, Maltese and Shih Tzu. More breeds popular in teacup sizes are the Boston Terrier, French Bulldog, Papillon and Poodle. Breeders selectively breed small- or Toy-sized dogs to create even smaller dogs that they classify as Teacup size. There are no dogs that are a dedicated Teacup breed, but breeders have created Teacup versions of many Toy-size and even larger breeds.
The Pomeranian Teacup breed can weigh as little as 2 pounds. The Pomeranian breed is of Slavic origin and could once weigh up to 30 pounds. Breeders have selectively bred Pomeranian dogs to be small, and they are now classified as a Toy breed or smaller.
The Yorkshire breed, commonly known as Yorkies, were bred to be rat hunters. Even with their small stature, Yorkies may try to pick fights with larger dogs. Teacup-sized Yorkies can weigh as little as 2 pounds.
The Chihuahua breed originated in Mexico and is one of the smallest breeds to evolve naturally. Breeders intervened to create Teacup-sized Chihuahuas, which can be as small as 4 pounds. Teacup-sized Chihuahuas need a lot of exercise and space.
Some animal activists object to the breeding of Teacup-sized dogs because of the possible effects on the dog's health and the risk of inbreeding. Decreasing the size of a breed may increase the risk of weak bones and organs. Teacup-sized dogs are often bred from the runts of a litter, which can result in weak immune systems and poor genetics. Purchase dogs from reputable breeders to avoid these issues.