one dog is not problem,. I usually solve that with a rock in my pocket(I know where is problematic dog)and preapare myself. My trauma is one big house with 3 dobermans. They put they ugly heads through the fence and start barkling. Until now they never cross that fence but I'm trying to avoid that place if possible.
My experince is that a smaler dogs are chasing. Anti dog spray is good idea for them.