From The Arthur Conan Doyle Encyclopedia
"Stone" Bulldogs is an article published in The Leeds Mercury on 11 october 1906.
The most famous bull dog in dog fanciers' records was that named after the hero of Sir A. Conan Doyle's "Rodney Stone." This animal was bought for £l,000 by Mr. Richard Croker, and died in America. There grew up across the Atlantic a craze for descendants of this dog, and animals with a strain of the Stone blood are eagerly sought for. It is stated that three American dog fanciers are now in London endeavouring to form a corner in Stone bull dogs, which fetch nearly £l,000 each.