I guarentee it will out run you no matter how quick you are.
In my experience, stop, dismount, make self look as large as possible and bellow at it.
So far its worked everytime.
It thinks you are prey, when it realises there’s a good chance its the prey it finds something less painful to do.
Having said that, i hate irresponsible dog owners(being a very responsible one myself), maybe contact the plod and get them to go round for a ‘chat’.