I've tried AirZound, but it works marginally, and am thinking of removing it as I need the water bottle cage. If you are using Mace, have you considered pepper spray, R.E.I. carries a product I believe is called Bear Attack. or Bear Assault, It has been documented to stop Grizzlies. I love dogs, unless I'm on bicycle or walking.
Where in the States are you located? I used to have dog problems years ago just south of Seattle, but in recent years have had no difficulty, I think due to owners being held liable when their (gentle, wouldn't hurt a flea, pet) went wild.