The Animal Kingdom, by Baron Georges Cuvier. London, Wm. S. Orr and Co. 1851
A New Edition, with additions by W. B. Carpenter, M.D., F.R.S., and J. O. Westwood, F.L.S.Translated and adapted to the present state of science (The Mammalia, Birds, and Reptiles, by Edward Blyth)
The Domestic Dog (C. familiaris, Lin.)--Distinguished by its recurved tail, but otherwise varying infinitely with respect to size*, form, colour, and quality of the hair...
The wild Dogs, and those which belong to savages, such as the inhabitants of Australia, have straight ears, whence has arisen a belief that the European races, nearest to the original type, are our Shepherd's Dog and Wolf Dog; but comparison of the crania indicates a closer approach on the part of the French Matin and Danish Dog, after which follow the Hound, the Pointer, and the Terrier, which chiefly differ in size and the relative proportions of parts. The Greyhound is more attenuated, and has the frontal sinus smaller, and scent weaker. The Shepherd's Dog and Wolf Dog resume the straight ears of the wild ones, but with greater developement of brain, which continues to increase, together with the intelligence, in the Barbet and Spaniel. The Bull-dog, on the other hand, is remarkabel for the shortness and strength of its jaws. The small pet Dogs, the Pugs, lesser Spaniels, Shocks, &c., are the most degenerate productions, and exhibit the most striking marks of that influence to which Man subjects all nature.
Thibet Dog and Wild Indian Dog