This article is from the Whippet Breed FAQ, written by firstname.lastname@example.org (Nancy Bennett).
There are dogs who have been referred to as "long-haired Whippets",
but it is the opinion of the American Kennel Club and the American
Whippet Club that these dogs are actually mixed-breeds. They are not
recognized by AKC or any other major canine registry, and cannot
compete in events such a racing or coursing.