"Naruto's Growth…!!" (ナルトの成長...!!, Naruto no seichō...!!) is chapter 75 of the original Naruto manga.
Summary
Kiba, remembering what a terrible student Naruto was, states that their fight will be an easy victory. He and Akamaru, a dog and thus a permitted tool of battle, immediately attack, surprising Naruto by their speed and ferocity. Determined to not be looked down upon, Naruto writes off Kiba's attacks as pathetic. Kiba throws a smoke bomb to block Naruto's vision while Akamaru attacks him. When the smoke clears Akamaru stands beside a defeated Naruto. Akamaru returns to Kiba but immediately bites him, being Naruto in disguise while a shadow clone retrains the real Akamaru. The observers are impressed by Naruto's tactics.