Hi Is a 27"x26" dog house big enough for 2 pekin ducks to sleep in? It is 36" high. They are sharing a 5x12 run that will later be expanded to 20x12 run with some chickens. We take them into their pen in the garage at night, but now it is time to move out. They will free-range or range in a larger less secure pen a few times a week. If you don't think this is big enough, what size should I get? Thanks!