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
Russkiy Toy older of the two, with the long coat type first appearing in 1958. Until the 1990s, the breed was almost unknown outside of Russia, and so relatively few details on associated health issues are known. The Russian Toy was originally bred as a rat fighter and as a watchdog, and can still exhibit the vocalization expected from the latter. It is a friendly dog and can become very attached to the family unit. Due to its size and similarities to the chihuahua, the two are often compared. The Russian Toy is one of the smallest breeds in the world, measuring