I would never let a dog or owner scare me from riding. If I was in that situation, I would ride by and ignore the dog until it actually does attack (most never do, they just chase) and when the dog does bite, or make me crash, then it's game on! If the dog bites you and you call the police, they have no choice but to report.
Of course, nobody wants to be bitten by a dog, so be careful.