Bikebat - this would be an example of why there's a need for leash laws. BUT I know that in the country, that can be moot. Something about the southern mind set. Has it occured to the owners how they'd feel if the dog was injured by being hit by a car? I know of riders who have pepper spray to use on dogs - if their humans won't control the dog at least the dog might learn that chasing cyclists is a bad thing.