I got this off a website
A Lurcher is not a specific dog breed; it is a type of dog. By definition, a Lurcher is a Sighthound cross, most often part Greyhound. Lurchers that are the result of a cross of two Sighthounds (such as, the popular cross of a Greyhound and Deerhound) are a subgroup of Lurchers called Longdogs.