Your bear was after the dog food, I doubt it would mess with your ducks, The blk bear that comes around here was after the blk oil sunflower seeds in my bird feeders, after I Remember to bring them in each evening and my dh shot off the shot gun he hasn't been back as far as we know. But he came right up next to the house for the bird feeders and never went near the coop and it's right here too. I think it would have to be starving before it goes after our ducks and chickens. At least here anyway. But having outside dogs is as good or better than the predator lights I have flashing.