Loads of people on here seem paranoid about dogs !!!!! But the OP has actually been bitten wich is quite different. Only two choices realy, just shrug it of and lick your wounds or report it to the police. I've never been bitten and wouldn't tolerate my own dog bitting me, let alone someone elses.
p.s
If it was coming in at you, and you thought it was going to bite you a big kick would be well in order.