How many types of Shiba Inus are there?

How many types of Shiba Inus are there?
There are three types of Shiba Inus originating from Japan. The Mino, Shinshu, and San’in are regional lines of Shiba Inu, the latter being the variety that most closely resembles the common Shiba Inu found in the United States and in many other parts of the world. While the others are less commonly found outside of Japan, all three breeds are still bred in Japan. 
The Shiba Inu is also the smallest of six types of indigenous Japanese dogs.