I've only been chased twice by dogs that had genuine intent. One got close enough to make a lunge for my right foot, but he must have been a novice and missed as the pedal stroke went around. He got two eyesockets full of Lemon-Lime Gatorade, and that was that. The barking and the pursuit ended immediately. The second one was serious serious, but I saw him before he saw me, so a brief period of hammering made for a distance he couldn't cover in time. That dog pursued me for probably 1/3 of a mile.
I don't think there's a real defense against what happened to the OP-- though I've never experienced a "stealth dog." The barking usually starts up as soon as I'm in sight, or when they think they're in striking distance. Gatorade in the eyes 100% works. I think it would work on a person.
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