Sadaharu is a member and a pet of the Yorozuya, but is similar to being their mascot in gintama series,
Sadaharu He is a quite large white-furred dog with a red collar. He has Black eyes, he is tall about 170 cm weigh about 300 kg
Sadaharu was originally an Inugami, a dog of god. in the past sadaharu lived and take care by the Priestess Sisters Ane and Mone. Sadaharu, along with his partner in charge of protection and defense, komako, were entrusted with protected the ryuumyaku Dragon's Heart at the ryuuketsu Dragon's cave on Earth. Afterward the aliens they built the Space Terminal over the Dragon's Crave. Priestess sister leaving sadaharu because they without a job. And expenses became too high and they were forced to give Sadaharu away, and so they left him in the custody of the Yorozuya. Sadaharu has stayed with them ever since.