"lady brown is talking to her dog in japanese"
in which language does lady brown talk to her dog.
is it correct?

The language is Japanese and if you are talking about the spelling, that is correct. the sentence is correct.

The details that best show evidence of tribal traditions are, "never in the history of his people had a man married a woman who spoke a different tongue” and "it has never been heard," was the verdict of an old man speaking a few weeks later.