Whippets were originally greyhounds that were deemed unsuitable for hunting because of their size. They were returned to their peasant breedersafter 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 When the Forest law was repealed, these "miniature greyhounds" became popular in the sport of dog racing. This has led to Whippets being described as "the poor man's racehorse." They are still frequently used as racing dogs today, as they have the highest running speed of breeds their weight: 40 miles per hour (64 km/h) and even challenge greyhounds for top speed. Whippets are, however, the fastest accelerating dog in the world.