In the feline world you find no such diversity, of form, shape, disposition, coat, size, etc, as you do in the canine. Dogs differ from each other in both the size and conformation of the skeleton, and in many other important points, almost as much as if they belonged to entirely different species. Mark, for instance, how unlike the bulldog is to the greyhound, or the Scotch toy-terrier to the English mastiff; yet, from the toy-terrier upwards to the giant Saint Bernard, they are all _dogs_, every one of them. So is the jackal, so is the fox and the wolf. The domesticated dog himself, indeed, is the best judge as to whether any given animal belongs to his own species or not. I have taken dog…
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