Akamaru Unleashed! Who's Top Dog Now?

is episode 44 of the original Naruto anime.

Synopsis
Naruto is immediately at a disadvantage, as Kiba fights with the assistance of his dog, Akamaru. Despite these odds, Naruto gains the upper hand early on by using Kiba's overconfidence against him. Once Kiba calms down, he regains control of the battle. He and Akamaru consume special pills that restore and double their chakra. Once powered up, Kiba and Akamaru use a combination of Four Legs Technique and Beast Human Clone to overwhelm Naruto with two beastly opponents. Although Naruto falls, his desire to win only increases with Kiba's taunts.