The people of Bohai probably made use of these big horses to improve the stock of their traditional horses. As a result, these horses or their descendants must have been brought to Japan. In thinking of possible communication among ancient Japan and Eurasian countries, consider this. Horses are domestic animals. Dogs, who are also domestic animals, are looked upon in a different light than are horses.
Dogs are much closer to people than are horses.
The position of dogs shows the high possibility of communication with their masters, i.e., people of many nations. Japanese dog breeds are separated into two categories. One category includes breeds such as the Shiba, Kai and Kishu, The other category includes breeds such as the Akita and Hokkaido. The blood type of the latter group is different from that of former group. The former group is the G-type, which is common with other Asian dog breeds.