What is "longdog"

n. A type of crossbreed greyhound

A Longdog is a type of moderately long dog; it is a crossbreed between two sighthounds. They are distinct from the Lurcher which is a cross between a sighthound breed and a non-sighthound breed (usually a herding breed, gun dog or a terrier). The Longdog is an attempt to create a better coursing dog, and is not expected to have the working qualities of a good Lurcher, although a few come close.