I think the true Deerhound that lived long ago is also long extinct and attempts to recreate it have mainly been in the hands of show minded people and have failed in all but looks. The modern type crosses with Greyhounds are producing what I think used to be called the Scotch Greyhound. From what Ive read you would have to test a dog on a lot more than Hare and Roe to call it a true Deerhound.