Well, about 11 of mine are just free ranging all the time and they come sleep in the barn at night. The barn door is always open, so they come and go whenever. The other 4 are separated out for breeding and they have access to the barn from their 50x50 foot pen via a doggie door. They too like to sleep inside. I can't see them enjoying a closed in space like chickens though, so I'm not sure about the dog house. I don't think mine would go in there on their own. The barn pen for those four in the breeding area is 8x8 feet and I think that is pretty much the perfect size for 4 geese. That door is alwasy open too, so it isn't like they are forced to stay inside either.
Hope that helps!