Yeah, why is it that it's the small yappy dogs that seem to be the worst offenders? Too much in-breeding? I've never been bitten by a dog while riding. Most normal size dogs stop chasing if I stop or ride out of their territory.
But I'd agree with reporting it to an animal control or sheriff's office. Even if nothing is done toward your incident, at least there'll be some data in the system that maybe a future statistician looking to address this issue can use for support.