This guy must have just been swimming down near the Hyde Street Pier and Ghirardelli Square: I found him on Polk Street in Russian Hill and he smelled like salt water. (And wet dog.) And that’s the closest accessible salt water to Russian Hill.
Another picture after the break.

Yes, that is my finger that you're being treated to. Sorry, but I couldn't cut off his tail, and I really love the texture of his fur, so...