Summoning: Earth Release: Tracking Fang Technique

This jutsu allows Kakashi to summon his own personal Ninken to perform special tasks. After he marks an opponent with his blood, Kakashi rolls out a scroll and smears his blood across it. Afterwards he places it between his hands and makes the seals before he slams the scroll into the ground. The Ninken are summoned there and travel through the ground following the scent of the blood. When the target is found, they erupt from the ground and hold down the opponent with their mouths. Kakashi uses this to immobilize an opponent for his Lightning Cutter.

In Naruto: Ultimate Ninja, Kakashi's 2nd special move is a variation of this technique in which Bull bursts out of the ground and strikes the enemy with a double bladed sword which he holds in his mouth.