It's not PC to say this, but hiring a GS, or a Pit, or a Ford Explorer for their deterrent value is a side issue...If you want a Shepard as a weapon against cat calls, or an SUV as a freeway battering ram, you're in need of counseling.
My faves are Pits, Dobies, Bichons, and plain old yellow mongrels; I don't now about Bichons, but any of the others would willingly take on bad guys and/or alligators simply because they were your friend.
PS: I'm off now to walk an 11 pound min. poodle here in the big city; guess who's in protective mode.
I have a 22 lb deranged Jack Russell that drinks beer and loves chips and salsa. When she gets a snoot full she thinks she’s a 125 lb GS.