Toy dog term teacup dog, thus the toy/teacup boundary remains fuzzy. The standard size for a toy dog ranges from 4 to 7 pounds; anything smaller than the standard size of a toy dog may be a runt of a litter. No official size defines a teacup dog, but unofficially a teacup dog is considered to be a dog that is 17 inches or less and weighs 4 lbs or less at the age of 12 months. There are no specific teacup dog breeds, but popular types for breeding teacup dogs include: Shih Tzu, Chihuahua, Yorkshire Terrier, Poodle, Pug, Maltese, Pomeranian, and
English Toy Terrier (Black & Tan) Tan Terrier until the 1920s when they were split into two breeds, the larger Manchester Terrier and the smaller Black and Tan Terrier (Miniature). The name English Toy Terrier (Black and Tan) was adopted in 1962. Black and Tan Terriers of all sizes were exported to Canada and the USA, founding a population which was largely isolated from the European one until very recently. In North America the two sizes were also split into two breeds until 1958 when declining numbers of the Standard Manchester Terrier prompted the American Kennel Club to re-defined them as a single breed with two