Chihuatarō (チワ太郎) is the ghost of a Chihuahua.
Chihuatarō is a normal looking Chihuahua as a normal spirit. Once merges with the ghost of a student, he looks like a Chihuahua with glasses wearing a school uniform.
In his class at Sankai High, Rinne used dog food to attract him and tries to convince him to abandon his regrets, only for him to eat Rinne and leave. Rinne nevertheless managed to contain him, but he ends up fusing with a ghost boy, who hopes to date Sakura. Rinne had to take Sakura to Kyoukai to lure them, and uses a Fire wheel to separate them, then they would both go to the Wheel of Reincarnation.
- Chihuatarō is the first ghost seen in combat with Rinne.