macecananda.com I can't say I ever tried it, but this stuff is designed for dogs.  Yotes follow me all the time in these parts.  Every once in a while I will catch sight of one following my trail but they have always maintained distance. I think they are more curious than anything.  I never really considered them a threat.
I don't think I would ever consider spraying down Coyotes with bear spray as there are plenty of better ways to get them to bugger off. I would likely end up getting most of it in my own face by accident and be blind myself.  That wouldn't exactly make me feel better in the uber rare occassion I was surounded by maneating dogs.
The bears out here are huge and they do kill people on occassion.  I do not fear them but I give them the respect due.  As a result I carry bear spray during season and know how to use it properly.  They say you stand a better chance of surviving a bear attack using bear spray properly then you would with a firearm.  Hope I never have to test that theory.