Found this discussion of 10 best personal protection dogs, and felt it was worth passing along.
Not a lot of surprises, and lots of meaningful discussion of the reasons for inclusion in the list.
For those who are pressed for time, the list is covered during the first 20 minutes or so, and the rest of the video contains practical advice, and comments & questions from callers.
LET'S TALK: JOHN ANTHONY'S TOP 10 PERSONAL PROTECTION DOGS