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Baiu and his team had the unfortunate luck of confronting Gaara's team during the Chuunin Exam. The Genin team leader Sigure sought Gaara's scroll, unfortunately he underestimated his power. Sigure attempted to use his raining needles technique but Gaara's sand protected him. Gaara then took the opportunity to confine Sigure with the desert coffin technique and crush him. Shocked, Baiu and his teammate tried to pacify Gaara by giving him their scroll, but Gaara also encased and crushed them.

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Baki was ordered to watch over Gaara in preparation for the invasion of Leaf by Sound and Sand. While in Leaf Village, he secretly met with the Sound spy Kabuto. The Chuunin exams third preliminary test examiner Gekkou Hayate was attempting to listen in but he was discovered by Baki and Kabuto. Hayate fled but Baki followed, fought and killed him. At the start of the invasion of Leaf, Baki challenged to a fight the examiner of the third Chuunin test, Genma. He and Genma fought to a standstill, with Baki retreating once their forces had been defeated.

Baki would return to Hidden Sand and learn that their Kazekage had been killed by Orochimaru, who had been impersonating their leader for over a month. Approximately three years later, Baki would still be an active ninja in Hidden Sand; attempting to do his part to protect his village and retrieve Gaara, who had been captured by Akatsuki.

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Kakashi called on Bull and the nin-dog pack to track and capture the Missing-nin Momochi Zabuza. They managed to bite onto the missing-nin and pin him in place. This allowed Kakashi to use Raikiri without fear of a counter attack. A short time later Bull and his fellow nin-dogs would be called upon by Kakashi to track down Naruto and his team who had gone off in pursuit of Sasuke.

Several years later Bull and the nin-dog pack were called upon to track down Akatsuki member Sasori using a small piece of his clothing. Some weeks later, Kakashi summoned the pack to help track down Uchiha Itachi. Bull was partnered with Naruto, Hinata and Yamato.