And somewhat later, when the dogs had learned to dodge the blows of the club, to snatch it out of the hands of the man, perhaps, we can believe that another great genius came along and proved that by means of a stone, skilfully hurled, dogs could be killed before they were near enough to bite. And here began the art of throwing missiles at an enemy, which has culminated in the invention of great guns which hurl projectiles for 60 miles.

This dog as a dispatch-bearer is three and a third times as efficient as a man. for in three minutes it will deliver to local headquarters the message being written by the officer, whereas a human courier would require ten minutes to make the trip. Only one man is allowed to feed this dog - its keeper at headquarters. Soldiers are not allowed to pet the animal, as its affection for its keeper must be undivided.

Under such convincing tutelage, no doubt the dogs gradually came to have a great and healthy respect for man, the one mysterious creature who could fight them with something more formidable than his teeth and claws, and while they were still at a distance, where they could not use their own. Perhaps there came to be a mutual respect. Both of these powerful races were largely carnivorous and hunted for a living.

Sometimes when the man was hunting, probably the dogs would follow at a respectful distance, and when he had made his kill with a club or a stone, or later with a spear, they would clean up the parts of the carcass which he did not carry off.

Sometimes perhaps the dogs would run down and bring to bay some dangerous quarry which would have been too fleet for the man, and while they were circling about trying to avoid the death which was sure to come to some of them before the rest could break their fast, the man would come up and with his crude weapons kill their enemy, take what he needed for his own use, and yet leave them an ample feast. And because they were useful to one another in this way, we can easily imagine that the man and the dog would gradually form a sort of partnership in the chase.

Again, when man lived in caves he was doubtless an untidy, not to say filthy, creature, who after feeding would toss the bones and other refuse just outside his home, until the place looked like the outside of a fox burrow when the hunting is good.

Like the famous Greek athlete who ran from Athens to Sparta to summon aid in the repulse of Persian invaders, this dog scurries over shell holes and mined areas, wriggles through barbed wire, and braves an artillery barrage to carry a vital message to headquarters when telephone wires have been shot away and communicating trenches have been made impassable for men (see pages 17 and 73).

Wild dogs when they had been unsuccessful in the chase, perhaps, and consequently hungry, would be attracted by the odor of this waste food and would come and carry it off. They would come furtively at first, but as they found they were not molested they would come boldly, and by thus disposing of refuse that would otherwise become offensive even to primitive man they performed a service in exchange for benefits received.

In this way man would become used to, and would even encourage the presence of, dogs in the vicinity of his home.

Then, with so many wild dogs living near by, it is certain that occasionally their dens would be found by the man and the puppies carried home to amuse the children. Such puppies would grow up with little fear of their human hosts, and by their playful, friendly ways would probably win for themselves at least tolerance, if not actual affection, and dogs would become a recognized part of the household.

The puppies of these dogs would be a little tamer than their parents, and those of the next generation a little tamer still, until some of them became so domesticated as to have no thought of ever returning to the wild state.