Which dog breed is a miniature of greyhound?

Whippets were originally greyhounds that were deemed unsuitable for hunting because of their size. They were returned to their peasant breeders after being maimed so that they could not be used to hunt and break the forest law. These maimed dogs were bred together and used to catch rats, and hunt rabbits. When the forest law was repealed, these "miniature greyhounds" became popular in the sport of dog racing.