Tadakichi San is a large, white Great Pyrenees dog featured in the comedy slice-of-life anime series Azumanga Daioh. Owned by Chiyo Mihama, Tadakichi San is beloved by all the girls in the group for his gentle and calm demeanor. He often serves as a means of transportation for Chiyo, who rides on his back. Tadakichi San provides comic relief and warmth, symbolizing innocence and comfort among the group of friends throughout the series.