Whip

From DwarfFortressWiki

A whip is a weapon that is made out of twined strips of material. Although still doing weak damage, it causes gore damage, which can cause massive bleeding or pain. Effective against living, preferably small, unarmored creatures. Very weak against undead creatures. Whips are unusable by dwarves, but goblins use them sometimes, possibly to control their slaves. Whips can also be used to control hauling animals. A better version of a whip is called a scourge.

It uses the lasher skill.