Electric fencing as an addition to a secure tight coop and run is the best of protection! I currently am not using it but have in the past when I had a need to! Bears are very rare here but determined dogs, raccoons, mountain lions, coyotes and bobcats have been a threat in the past. I still have a very good wide impedance fence charger and insulators, etc. ready to plug in. Baiting an electric fence with scent caps or similar attraction devices will insure the animal gets a charge to their sensitive nose before they just bull on through! Multiple guard dogs allowed to roam the coop area help me a lot with predators but are no good insurance against attack when they are not present. The predators usually case the joint before they attack and that way the dogs may help, being often present. Lap dogs are more like bait here. I once witnessed a redtail hawk fly off with a woman's chihuahua in her front yard! Screaming didn't help.