Which dog breed is the smallest of the sighthounds?

The Italian Greyhound (in Italian: piccolo levriero italiano) is a small breed of dog; of the sighthound type, sometimes called the Italian for short, and nicknamed the "IG" or "Iggy".

The Italian Greyhound is the smallest of the sighthounds, typically weighing about 8 to 15 lb (3.6 to 6.8 kg) and standing about 13 to 15 inches (33 to 38 cm) tall at the shoulder. They are in the toy group in the UK and US but in the sighthound group in the Fédération Cynologique Internationale (FCI).

The Italian Greyhound's chest is deep, with a tucked up abdomen, long slender legs and a long neck that tapers down to a small head. The head is long and pointed, like a full sized Greyhound. Overall, they look like "miniature" Greyhounds. Though many Italian Greyhound owners dispute the use of the term "miniature greyhound" in reference to the breed itself, by definition of the American Kennel Club they are true genetic Greyhounds, with a bloodline extending back over 2,000 years. Their current small stature is a function of selective breeding. Their gait is distinctive and should be high stepping and free, rather like that of a horse. They are able to run at top speed with a double suspension gallop, and can achieve a top speed of up to 25 miles per hour (40 km/h).