They are sighthounds (also called gazehounds), meaning that they hunt by sight rather than smell. (esgao.org)
Also known as gazehounds, they're noted for speed. (cuteness.com)
Sight hounds (sometimes called gazehounds) include the Borzoi along with such breeds as the Afghan Hound, Greyhound, Ibizan Hound, Irish Wolfhound, Pharaoh Hound, Saluki, Scottish Deerhound, and Whippet. (soonervet.net)