I don't get those, but I do get the occasion friend request when I have NO clue who the person is.
About 75% of the time it will turn out to be someone who has a Leonberger and has seen me on one of the Leo boards.
A couple of times, however, I've been fooled.
In fact, a few months ago, Jamis and I were fooled by the same individual. I think we both thought the person was an APS member...
we both had very weird conversations with him/her/it...