Most people don't realize this, but there are modern dog breeds that had actually disappeared before the end of WWI, but were restored in the years after the war. After WWI, for example, breeders literally couldn't find a single pure specimen of the English Mastiff. There were no breeders who maintained them during the war. They had to actually go back to the drawing board, do a little mixing here and there with the Mastiff mixes they could locate, and recreate the breed.
Same with the Irish Wolfhound. It had completely disappeared by the middle 19th century. Only some mixes of it with other breeds were still known to exist. Breeders took those mixes, added in some other similar purebred dogs (to include Russian Wolfhounds and Giant Schnauzers), and eventually got a breed that looked like the old paintings of the Irish Wolfhound.
