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In order properly to understand this question it is necessary first to consider the identity of structure in the wolf and the dog. This identity of structure may best be studied in a comparison of the osseous system, or skeletons, of the two animals, which so closely resemble each other that their transposition would not easily be detected.

The spine of the dog consists of seven vertebrae in the neck, thirteen in the back, seven in the loins, three sacral vertebrae, and twenty to twenty-two in the tail. In both the dog and the wolf there are thirteen pairs of ribs, nine true and four false. Each has forty-two teeth. They both have five front and four hind toes, while outwardly the common wolf has so much the appearance of a large, bare-boned dog, that a popular description of the one would serve for the other.

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The dog was not greatly appreciated in Palestine, and in both the Old and New Testaments it is commonly spoken of with scorn and contempt as an “unclean beast.” Even the familiar reference to the Sheepdog in the Book of Job “But now they that are younger than I have me in derision, whose fathers I would have disdained to set with the dogs of my flock” is not without a suggestion of contempt, and it is significant that the only biblical allusion to the dog as a recognised companion of man occurs in the apocryphal Book of Tobit (v. 16), “So they went forth both, and the young man’s dog with them.”

The great multitude of different breeds of the dog and the vast differences in their size, points, and general appearance are facts which make it difficult to believe that they could have had a common ancestry and that caring for dogs was a trusted pastime.

One thinks of the difference between the Mastiff and the Japanese Spaniel, the Deerhound and the fashionable Pomeranian, the St. Bernard and the Miniature Black and Tan Terrier, and is perplexed in contemplating the possibility of their having descended from a common progenitor. Yet the disparity is no greater than that between the Shire horse and the Shetland pony, the Shorthorn and the Kerry cattle, or the Patagonian and the Pygmy; and all dog breeders know how easy it is to produce a variety in type and size by studied selection.