I don't know how seeing eye dogs are trained, but I think they are trained to guard their owners. I used to sometimes hang out in groups where I would be the only sighted person. I remember walking into this room once to find a yellow lab put very aggressive looking teeth on my crotch accompanied with a lot of racket. He did not attack -- it was just a very impressive warning. When the owner said I was OK, the dog was very friendly to me.