"No! No!" I cried. "Go away! Please, go away!"

It crouched there, not five feet from me, its head lifted, hissing, snarling.

"Please, go away!" I Wept.

I saw its belly lower itself to the ground, the bead still lifted, watching me. Its tail lashed; its eyes blazed. It inched forward. It had two rows of fangs.

I looked to the left and right. It squealed hideously. It came closer.

It was a precisely trained beast, but no training is perfect. It is a balancing of instincts and conditioning. It is never perfect. The beast, at the nearness and intensity of my scent, was becoming uncontrollable. The critical attacking distance for a sleen in the wild is about twenty feet. This distance, in a herd sleen, of course, is much smaller. I could see its excitement mount. The fur about its neck rippled and bristled. Then I saw it gather its four hind legs beneath it.

With a cry of misery I turned and fled. I ran back toward the training pit and the open cage that had been designated for occupancy by the Earth-girl slave.

I ran wildly, helplessly. It ran behind me, snapping and snarling. I felt its breath on my legs. It cut with its teeth at my heels. I gasped. I fought for breath. It drove me faster and faster.

The beast was well trained. It knew well how to herd a slave girl. It had a sense of the distance, and of my limitations; its speed and endurance which, I suspect, were superior to my own. It had herded other girls. It kept me at my limits, not permitting me to think, but only to run, frenziedly, madly, a driven, herded slave girl, seeking her cage.

I was at its mercy. It set me the pace which I must make, if I would live.

I cried out with misery, running.

It drove me perfectly.

My only hope of survival was to reach the cage, and lock myself within it, where I would await, confined, the pleasure of a master.

I threw myself into the cage on my hands and knees and, wildly, turned and flung down the gate behind me, it securely locking. The beast tried to reach me, but could not do so. I was safe within the cage, but locked within it, at the mercy of a master. I had been herded.

What hope had a girl for escape on a world which contained sleen? How completely we belonged to our masters!

There are many varieties of sleen, and most varieties can be, to one extent or another, domesticated. The two most common sorts of trained sleen are the smaller, tawny prairie sleen, and the large, brown or black forest sleen, sometimes attaining a length of twenty feet. In the north, I am told the snow sleen has been domesticated. The sleen is a dangerous and fairly common animal on Gor, which has adapted itself to a variety of environments. There is even an aquatic variety, called the sea sleen, which is one of the swiftest and most dreaded beasts in the sea. Sea sleen are found commonly in northern waters. They are common off the coast of Torvaldsland, and further north.

In the wild, the sleen is a burrowing, predominantly nocturnal animal. It is carnivorous. It is a tenacious hunter, and an indefatigable tracker. It will attack almost anything, but its preferred prey is tabuk. It mates once a year in the Gorean spring, and there are usually four young in each litter. The gestation period is some six months. The young are commonly white furred at birth, the fur darkening by the following spring. Snow sleen, however, remain white-pelted throughout their life.

Most domestic sleen are bred. It is difficult to take and tame a wild sleen. Sometimes young sleen, following the killing of the mother, are dug out of a burrow and raised. If they can be taken within the first two months of their life, which seems to be a critical period, before they have tasted blood and meat in the wild, and made their own kills, there is apparently a reasonably good chance that they can be domesticated; otherwise, generally not. Although grown, wild sleen have been caught and domesticated, this is rare. Even a sleen which has been taken young may revert. These reversions can be extremely dangerous. They usually take place, as would be expected, in the spring, during the mating season. Male sleen, in particular, can be extremely restless and vicious during this period. The mating of sleen is interesting. The female, if never before mated, flees and fights the male. But he is larger and stronger. At last he takes her by the throat and throws her upon her back, interestingly, belly to belly, beneath him. His fangs are upon her throat. She is at his mercy. She becomes docile and permits her penetration. Shortly, thereafter, their heat growing, they begin, locked together by legs and teeth, to roll and squeal in their mating frenzy. It is a very fierce and marvelous spectacle. It is not unusual for slave girls, seeing this, to kneel at their master's feet and beg their caress. After the female sleen has been taken thusly once, no longer need she be forced. She follows the male, often rubbing against him, and hunts with him. Sometimes she must be driven away with snarls and bites. Sleen, interestingly, often pair for life. Their rutting, however, is usually confined to the spring. Sometimes slave girls are called she-sleen, but I do not think this expression is completely apt. Sexual congress in the human is not confined to a particular season. We are not she-sleen. The heat of the she-sleen occurs in the spring. We are slave girls. Our masters keep us in heat constantly.

I looked across the sand to Chanda's cage. She had finished wrapping the cloth about her cut calf.

I hoped the wound was not deep. No one seemed to be concerned about her. I gathered that her leg would not be scarred, and that her value would not be lowered. If her leg did scar, with the result that her block value was diminished, it must be recalled that Clitus Vitellius, my former master, had had her for nothing.

Sleen are used for a multitude of purposes on Gor, but most commonly they are used for herding, tracking, guarding and patrolling. The verr and the bosk are the most common animals herded; tabuk and slave girls are the most common animals tracked; the uses to which the sleen is put in guarding and patrolling are innumerable; it is used to secure borders, to prowl walls and protect camps; it may run loose in the streets after curfews; it may lurk in the halls of a great house after dark; it may deter thieves from entering locked shops; it may stand sentry upon wharves and in warehouses; there are many such uses to which the sinuous beasts may be put; an interesting use which might be mentioned is prisoner control; a tiny circle is drawn and the prisoner must kneel, or assume some prescribed position, within it; then, should the prisoner attempt to rise to his feet, leave the circle, or break the position in the slightest, the beasts tears him to pieces. Aside from these common uses, sleen are put to other uses, too. In Thentis, for example, sleen are used to smell out contraband, in the form of the unauthorized egress of the beans for black wine from the Thentian territories. They are sometimes, too, used by assassins, though the caste of assassins itself, by their caste codes, precludes their usage; the member of the caste of assassins must make his own kill; it is in their codes. Some sleen are used as bodyguards; others are trained to kill in the arena; others perform in exhibitions and carnivals. There are many uses to which such animals are put. The herding, tracking and control of beautiful slave girls is but one use.

The gate to my cage was unlocked, and flung upward. The sleen outside had been fed and taken, by the men assisting Thurnus, on short ropes, to their cages. The men of Clitus Vitellius had left the sand pit, and the area about it, accompanied by his girls, including Chanda, who, too, had been released. The small crowd which had observed had now dissipated, with the exception of Melina, companion of Thurnus, and two or three peasant boys, who watched me. Sandal Thong, one of the girls of Thurnus, who had assisted in the training pit, had left, too, now, to attend to other duties, including the watering of the sleen. She wore a short slave tunic, white, of the wool of the Hurt, and a rope collar. She was a large, long-armed, freckled girl, of peasant stock. Clitus Vitellius, in the tunic of the warrior, remained in the training pit, to accompany Thurnus back to his hut.