I seem to be able to get by dogs once, but returning trips they are ready for me. Does the Zero motor put out a tone we cannot hear? I've seen cows turn their heads, horses get spooked. Also, what would be most humane way of protecting myself, I am afraid they will get ran over and wreck me, at which point it is them or me, as there is usually a pack. Yes we have a leash law, but no enforcement.