.um, how 'bout bear spray. It would work on any critter or person "in your business."
If still nervous, carry two cans. If still nervous, hike in town.
In reality, a weapon large enough to drop a bear in going to be heavy. Anything smaller, just ain't gonna drop him/her before they get to you and their adrenaline runs out.

I know Henry Firearms makes a couple take down type guns.

Google "bear banger" Illegal, but is done and carried by some bikers.

EDIT: I'm pretty sure they are illegal in Canada.