Longdog

A long dog (also long-dog or longdog) is any dog of sighthound type, whether pure-bred or not. It is usually a cross-breed between two sighthounds of different breeds, one of which is usually a Greyhound

Background
It is distinct from the lurcher, which is a cross between a sighthound and a working dog, usually a terrier or herding dog. And it is generally larger than a feist, which is an American cross.