you know... it was a fair question... & I'm as big a gun nut as anyone, butt...one might work quite well...
IF ... notice, thats a big "if"
...the contacts penitrate the thick hide enough to get good contact
...you hit it solidly on the 1st shot... they don't make tazer gun repeaters do they ???
I'm sure PETA would be happy to allow testing on "caged bears" if it would keep people from shooting bears with guns, in self defense
I was watching the ( showing my age ) "tube" the other day ( mine isn't a flat screen... yet ), & a guy was doing a "green hunt" & shot a white rhino with a bow, that had a tranquilizer tip on the arrow, so a vet could do a check up on the rhino... gotta admit... way bigger cahunas than I have...
I would suspect a tazer would have the same effect on bear, as it does a human, provided you got a good shot in, & the contacts were long enough to pentrate the thick fur & get good enough contact... also effective range would be much closer than I'd be comfortable trying it...