Henshin shitara Yari Houdai!: Maniac Wolf

Ken Yamano, who has a peculiar physiology that causes him to transform into a puppy in response to the pheromones of girls, somehow ends up living with a girl from his class...! He tries to unravel the mystery of his transformation, but he ends up causing a ruckus with the attractive girls at his high school as well, starting a special erotic comedy!

(Source: Kodansha, translated)