RUSSIAN WOLFHOUND is the answer to the 16 letter Crossword Clue for Borzoi.
Russian Wolfhounds, also known as Borzoi, are majestic dogs associated with Russian royalty. Often referred to as long haired Greyhounds, Russian Wolfhounds were used to hunt wolves in Russia. Russian Wolfhounds are sight hounds.
You may have come across a reference to the borzoi dog in popular internet memes.
See also: Borzoi vs Hortaya Borzaya