They are a sighthound breed that originated in England, where they descended from Greyhounds. Whippets today still strongly resemble a smaller Greyhound. Part of the Hound group, Whippets have relatively few health problems other than arrhythmia. Whippets also participate in dog sports such as lure coursing, agility, and flyball. Whippets are a medium-sized dog weighing from 15 to 42 pounds (6.8 to 19.1 kg). There are two height ranges for Whippets, depending on whether or not the dog is being shown in North America. The Fédération Cynologique Internationale and The Kennel Club both call for heights of 18.5 to 20 inches (47 to 51 cm) for males and 17.5 to 18.5 inches (44 to 47 cm) for females.