Thanks for all of the responses! I live in the "Wilds of PA" (or at least darn close) and I KNOW there are lots of animals around here that would be interested in a nice chicken dinner. I built my coop and run to be VERY secure (although not even MY house is bear-proof!!)
I used to live a few hours east of here between a 400 acre farm and a gun club/hunting preserve... We had bobcat, bear.. and god knows what else. My neighbor had a few dozen chickens and the biggest threat to them were the possums!
I'm going to wait and see what happens. I don't have power in my coop, so running elec out there would be a HUGE hassle (it's not close to the house). My dog is penned right next to it (until evening time, then she comes in), the food is all stored in metal cans... and I'm having my BF pee all around the fence! (I just don't have the equipment for that defense!)
I do know bears will naturally avoid people... unless they have a couple babies and feel that they are threatened. We have cats who live outside, their food is out by our garage... and the bear isn't interested in that...
Since we are out in the boondocks (with many much bigger "farms" surrounding us) I'm SURE there are more interesting (and profitable) places for this bear to stop for lunch.
My mother saw a MOUNTAIN LION in her yard TWICE (in central Mass)... but the only animal she had to protect was her poodle...
I have several rather large guns, and know how to use them... but I also have a camera... and I really prefer using that.
I guess if something is going to happen I'll have to learn the hard way... Just call me Roosevelt!