Welcome to BYC!I would get 4 large geese and two large ganders. Very protective of their entire yard and contents. We also have cement block under our fence attached to it and electric wire on top rail of fence. No problems except a ground squirrel came underground and came up to try to eat chicken food, but our head gander Spruce caught and killed the squirrel in record time and has been watching the hole he came out of until I covered it up. Good job Spruce.