The woman-owner had an emotional reunion with Ban at an animal care center after she recognized the dog from a TV news report.
Ban immediately jumped up and wagged her tail when her owner appeared, local media reported.
"We'll never let go of her," the owner, who wished to remain anonymous, was quoted as saying by a centre official, BBC News
"Toshio Suzuki, who runs the shelter, said the owner's name will not be released for privacy reasons. The only details provided about the owner are that she is a woman, she has an adult daughter and the family suffered tsunami damage - although officials were not specific".aol news
Earlier an Akita dog named Shane was also reunited with the owner who has given up hope of seeing his pet dog again after the tsunami hit his community.
The dog's owner reportedly set the dog free when he heard the tsunami warning to inform his neighbors of the approaching giant waves as he rushed to a school building on a higher ground. He tried to look for Shane but failed to find the dog.
After six hours Shane was able to locate him in the school building. Shane reportedly swam through chest-high water before being reunited with his guardian
Akita dogs are known for their devotion and loyalty to their owners.