Which, were I preparing to intrude on this dog's territory, would be warning enough for me...
As i learned after getting my first dog (since being a kid) after retiring, most non-dog people are deathly afraid of dogs, not knowing how to behave. Even my loveable Black (field) Lab was enough to get folks downtown waiting for the bus to clear the sidewalk (she has really big white teeth).
Not acting like Prey and giving a "foreign" dog a large berth while trying to command it seems to be effective. Having another dog along is definitely a plus.
Who, except for SWAT Teams wouldn't?