Ride right at it!Try and run it over(it
will get out of the way).The dog is expecting a chase(they
love to chase things)so when you chase it,it totally changes the game.9 times out of 10 the dog will screw off.For that 1 out of 10 that's where your bike is your friend.Keep the bike between you and the dog,pick it up to make it look more menacing.The dog can't even get close enough to bite you.So far so good,anyway.