Are there dogs at the antarctic research stations?
Not anymore, apparently the dogs were attacking the penguins.
I don't remember hearing that James Cameron had any stowaway rats on the Deepsea Challenger, so the bottom of the Marianas Trench is at least one other place humans have been exclusively.
I think the "distribution" is concerned with long-term habitation, which the Deepsea Challenger in the Marianas Trench was not.
To be fair, the ISS is not a long-term habitation either.