A dog’s love towards his family is unconditional, and a classic example of this is Hachiko, an Akita dog who was born in 1923 in Japan. He was adopted by an agricultural professor who took him home and took on the role as his new owner. Both of them formed a very special bond.
During their time together, the professor would take a train ride home each working day and be greeted by Hachiko at the train station. Hachiko would sit and wait for the professor at the end of each working day, without fail. The pair continued this daily ritual until sadly one day the professor suffered from a cerebral hemorrhage (brain bleed), and passed away, never to return to the train station again where his beloved companion was waiting.
For the next nine years, Hachiko attracted the attention of many people far and wide as each day, without fail, he would visit the train station as normal and wait for his owner, hoping to see his best friend step off the train and greet him once again.
Hachiko passed away in 1935, aged 11 years. A drama movie was released in 2009 based on the story of Hachiko and the professor, called Hachi.
Ref : Wikepedia
watch a brief video of the movie :