Akitas were specifically bred in Japan to hunt large game, so I don't think beavers would be too much of a problem. Plus, they're great family dogs. Extremely loyal and intelligent.

Here's a tidbit about the legendary Akita, Hachiko:

"In 1924, Hidesabur Ueno, a professor in the agriculture department at the University of Tokyo, took in Hachiko as a pet. During his owner's life, Hachiko greeted him at the end of each day at the nearby Shibuya Station. The pair continued their daily routine until May 1925, when Professor Ueno did not return. The professor had suffered from a cerebral hemorrhage and died, never returning to the train station where Hachiko was waiting. Every day for the next nine years the golden brown Akita waited at Shibuya station.

The permanent fixture at the train station that was Hachiko attracted the attention of other commuters. Many of the people who frequented the Shibuya train station had seen Hachiko and Professor Ueno together each day. They brought Hachiko treats and food to nourish him during his wait.

This continued for nine years with Hachiko appearing precisely when the train was due at the station."

That's fucking insane.