I'm going for the long legs = fast dog, short legs = slower dog.
I got chased by my neighbors shepard this morning. First time he has ever done that and it really scaried me. I need to remember to yell NO. I always shout Go Home. Not all dogs understand English and No is pretty universal.
I would rather try to out run Chihuahua then a shepard. I have yet to ever be chased by a Grey Hound. It usually is a lab or shepard (other then the Chihuahua).