"Dog house" is actually hidden access to a doggie door, providing visual & physical security against intruders. Could also protect dog door against weather! Not that we have a doggie door, but good idea!
Doggie shower in garage. Love this idea. Also seen it done like a mud room with a door to the exterior so the dogs can go in and out but can be closed off from the rest of the house (like a giant dog house with all the amenities attached to your house!