All seriousness aside, that is a pretty funny fail.

ILBob, I think Bear Spray is the same thing as pepper spray for humans. I believe that the main difference is the size of the container and percentage of OC. approx 1% OC for humans and approx 2% OC for bears. Since the container is larger and can hold more propellant, it can be sprayed further than a keychain sized container of OC spray. It also has more material to spray. I can't imagine this not working on a coyote.

I would also think an air horn would also work for coyotes too. They seem to work pretty well for regular dogs...so far.