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Even in the case of the breeds of the domestic dog throughout the world, which I admit are descended from several wild species, it cannot be doubted that there has been an immense amount of inherited variation; for who will believe that animals closely resembling the Italian greyhound, the bloodhound, the bull-dog, pug-dog, or Blenheim spaniel, etc. so unlike all wild Canidae ever existed in a state of nature?
There is a chapter in the Natural History of Animals that has hardly been touched upon as yet, and that will be especially interesting with reference to Families. The voices of animals have a family character not to be mistaken. All the Canidae bark and howl: the Fox, the Wolf, the Dog have the same kind of utterance, though on a somewhat different pitch.
But I may here state that, looking to the domestic dogs of the whole world, I have, after a laborious collection of all known facts, come to the conclusion that several wild species of Canidae have been tamed, and that their blood, in some cases mingled together, flows in the veins of our domestic breeds. In regard to sheep and goats I can form no decided opinion.
The more scientific aspects of the question may not be without interest to some of my readers. The fox belongs to the great order of flesh-eating animals called Carnivora, and of the family called Canidae, or dogs. The wolf is a kind of wild dog, and the fox is a kind of wolf. Foxes, unlike wolves, however, never go in packs or companies, but hunt singly.
I can hardly doubt that this rule is generally true, though difficult of proof. Among mammals, we see it strikingly displayed in Bats, and in a lesser degree in the Felidae and Canidae. We see the same rule in the distribution of butterflies and beetles.
In the remarkable memoir on the phosphorites of Quercy, to which I have referred, M. Filhol describes no fewer than seventeen varieties of the genus Cynodictis, which fill up all the interval between the viverine animals and the bear-like dog Amphicyon; nor do I know any solid ground of objection to the supposition that, in this Cynodictis-Amphicyon group, we have the stock whence all the Viveridae, Felidae, Hyaenidae, Canidae, and perhaps the Procyonidae and Ursidae, of the present fauna have been evolved.
Gould remarked to me long ago, that in those genera of birds which range over the world, many of the species have very wide ranges. I can hardly doubt that this rule is generally true, though it would be difficult to prove it. Amongst mammals, we see it strikingly displayed in Bats, and in a lesser degree in the Felidae and Canidae.
It has been suggested that the one incontrovertible argument against the lupine relationship of the dog is the fact that all domestic dogs bark, while all wild Canidae express their feelings only by howls. But the difficulty here is not so great as it seems, since we know that jackals, wild dogs, and wolf pups reared by bitches readily acquire the habit.
For instance, from Canis, the Dog, Canidae has been formed, to designate the whole Family of Dogs, Wolves, Foxes, etc. Nothing can be more superficial than such a mode of classification; and if these groups actually exist in Nature, they must be based, like all the other divisions, upon some combination of structural characters peculiar to them.
Who can believe that animals closely resembling the Italian greyhound, the bloodhound, the bull-dog, or Blenheim spaniel, etc. so unlike all wild Canidae ever existed freely in a state of nature?
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