Oldest breed of dog known to man: see images Akita Inu is the oldest living breed of dog known to man. It is believe to have existed since around 8000 bc and also believed to have first been in Japan. Though the exact date it came into existence is uncertain, archaeological discoveries suggest that a dog called the Matagi-Inu, which is believed to be the Akita’s ancestor, existed between 8,000 B.C. And 200 B.C. Akitas are named after the Akita prefecture, the northernmost area of the Japan’s main island.