LOL. I’ve been scared by dogs before, of various breeds. It is very good that you have smart, quick instincts.
As a kid I used to hate it when dogs would chase after my pant leg while riding my bike. Why do they do that?
most dogs who chase cars and bikes...are of breeds that were bred to chase vamints...or one kind or another and dont know the difference between a kid on a bike...and a large rat...or a small coyote...
or so the legend goes