Hachiko is a true story about a dog in Japan and the special bond he shared with a professor whom he met when it was a little puppy. The story has been put forward exceptionally well by the cast and the director.
The movie has been kept extremely simple with minimum effort on the scenes, yet remarkably you are kept spellbound after a couple of minutes into the movie. And as the other reviews suggest, making the whole theater grab onto their tissues explains how good it really is.
Lastly, coming for someone who also rates 'Eight below' as one of his favorite's, a high rating of Hachiko would seem a little biased to many. But in my honest opinion I don't think that anybody who has watched this movie can rate it below 10.