In Thentis, for example, sleen are used to smell out contraband
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.
Slave Girl of Gor, p. 308