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 if the dog is being shown in North America or outside of 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. Whippets tend to be somewhat larger in the United States and Canada as the American Kennel Club and Canadian Kennel Club standards are larger; 18.5 to 22.5 inches (47 to 57 cm) for males, and 17.5 to 21.5 inches (44 to 55 cm) for females. Because colour is considered immaterial in judging Whippets, they come in a wide variety of colours and marking patterns, everything from solid black to solid white, with red, fawn, brindle, blue, or cream. The coat is short, smooth and close.
They are the fastest dog of their weight, capable of achieving speeds of 35 miles per hour (56 km/h). This is due to their unique way of running, which is referred to as a double suspension gallop. This gait results in four of the dog’s legs being off the ground twice in each stride, once when the legs are completely extended and again when they are tucked under the body.