What kind of animal is Sadaharu?

from gintama Wikia : Sadaharu was originally an Inugami (aka Dog God) of destruction/attack watched over por the Priestess Sisters Ane and Mone. Sadaharu, along with his counterpart in charge of protection/defense, Komako, were entrusted with guarding the 龍脈 ryuumyaku aka Dragon's Pulse at the 龍穴 ryuuketsu aka Dragon's Lair on Earth but after the Amanto came they built the o espaço Terminal over the Dragon's Pulse thus leaving Sadaharu and the sisters without a job. As time passed expenses became too high and they were forced to give Sadaharu away, and so they left him in the custody of the Yorozuya whom he has stayed with ever since.

I think his an alien,
but he looks like a dog...
so maybe his a half alien and half dog^^

In my opinion Sadaharu is gigant dog from other planet

I think is the mixture of dog+wolf genes

Dog