In my late teens I had Dog, Other Dog, Wrong Dog, Little Dog and Big Dog.
Dog was a stray I took in and a habitual run away who came home with a friend we then dubbed Other Dog.
While looking for them one day Wrong Dog popped out of the bushes and followed me home.
Big Dog joined the party one day in the back yard, and Little Dog was a neglected pup who actually grew bigger then Big Dog which added to the entertainment value. Not sure they are unique, but all of them together sure was.
I have yet to meet another Saboteur, although I do run into the odd Sabi.