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) varieties; Standard and Toy. The ETT is on the UK Kennel Club's list of vulnerable native breeds and great effort is being made to boost the popularity of the breed and develop a viable gene pool. The Kennel Club (UK) has opened the stud book, allowing the North American Toy Manchester Terrier to be re-registered as English Toy Terrier (Black & Tan) provided it is certified to be a Toy and not of the Standard variety. Some owners in Great Britain are against this decision; others see it as a positive way to preserve the breed. English Toy Terrier (Black