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
Mexican Hairless Dog Mexican Hairless Dog The Xoloitzcuintli (), or Xolo for short, is a hairless breed of dog, found in toy, miniature, and standard sizes. The Xolo also comes in a coated variety and coated and hairless can be born in the same litter. It is characterized by its sparse hair coat and a severe oligodontia. This phenotype is a consequence of Canine Ectodermal Dysplasia caused by a mutation on the Foxl3 autosomal gene. It is also known as Mexican hairless dog in English-speaking countries, and is one of several breeds of hairless dog. In Nahuatl, from which its English name originates,