During her short life as Jabba's favorite slave girl, Oola was held captive by a strong fiber leash that was attached to the tight collar around her neck. The leash was very light, and allowed her to perform several erotic moves when she was forced to dance before her Hutt master.
Jabba used the leash to keep his favorite slave girl within easy reach. The leash was locked to one of the rings on the front of the hutt's throne, though Jabba frequently held it himself as well so that he could drag Oola closer when he desired her.At the other end of Oola's leash was a tasseled, whip-like device that was often held in Jabba's grasp. Purportedly this end of the leash was used to punish and "flog" Oola when was disobedient or otherwise angered her master. While not particularly thick, this whip would leave little more than faint red marks on Oola's beautiful green skin but still cause the dancer pain. Jabba particularly enjoyed bending the young slave over and whipping her enticing backside until she begged him to stop.
Ultimately, Oola made the fatal mistake of refusing her master's advances. After a particularly heartfelt performance just prior to Leia's arrival, Jabba pulled on Oola's chain, intending to drag the dancer up onto his dais so that he could "reward" her. With fear in her eyes, Oola pulled back on her chain, and briefly struggled with her master before the hutt tired of her defiance, and triggered the trapdoor beneath the dancer's feet.
Jabba released Oola's chain, ensuring that she would live long enough to put on a final performance in the rancor pit, instead of being hung by her own chain.
It's unknown what happened to the leash when Oola met her fate by the rancor. It was either eaten along with Oola, or it broke by the rancor's massive jaw.
Oola was never given the customary dancing veils as she was hoping for. So she decided to pretend the leash was one in her performance. While she danced, Oola would often whip her leash around, further heightening Jabba's lust for her. Other times she would stick the leash between the perineal area of her body and ride back and forth on it to achieve orgasm in her costume, usually as an alternative means of performing a lap dance of her own in an attempt to distance herself from giving one to Jabba.
Luckily for Oola, it was long enough for her to move freely and dance all over the dancefloor. But when Jabba started pulling her towards him, there was enough of the chain for her to grab hold and pull back against her master. After realizing this, Jabba decides to use a shorter leash so he won't lose another slave girl the same way.