I think geese are great watch dogs when, as you said, they can see. The neighbor had one that chased my nephew up the hill and into his house every day when he'd get off the bus. Nipped him in the bum more than once!I’ve lost a few ducks on my ponds to a hawk and a bobcat. I got on the waterfowl forums then, wondering if adding a goose would help protect the ducks. The consensus was that the goose would fall prey to whatever was eating the ducks, and that they require more specialized housing than what I wanted to provide. I do think people keep watch geese, but that seems a little redundant when I have guinea fowl! My guineas have gotten to be better watchdogs as they’ve gotten older. The last time that a bobcat went for a duck, the guineas gave me plenty of warning first.