my recently acquired bike is a new fixture on my street, so the neighborhood dogs have taken to marking it with their piss. they love to piss on my front wheel and on my bike cover, and their bastard owners are obviously doing nothing to stop them. what i can do to ward off these damn mongrels? i know there is such a thing as doggie mace, but i think that's a bit extreme. does anyone know if there is some natural scent that dogs are repelled by?