Pure fashion, deerhounds went out Collie crosses came in to fashion thanks to the books by P*****r and H*****k, then saluki crosses came in and later bull crosses - although I think that these seem to be on their way out a bit now. All crosses have their enthusiasts. I have tried all of these and come back to the deerhound cross as my first love although I may very well get a pure bred deerhound bitch as my next dog. A lot depends on what you want a dog for, if it's just rabbiting then they are not the best dog for you, similarly if its only coursing then go with one of the line bred saluki bl