Stumbling around the Net, I came across these wonderful doghouses. Because I'm so into dollshouses and miniatures, I fell in love with them immediately, but I reckon Penny would hate them, because most of them involve living outside the main house (I think).
We do actually have a nice strong, weather-proof doghouse on our back patio, but have never once convinced Penny to set foot in it, except to sniff for rats. (They used to hide under the doghouse to eat the fruit they had snaffled from our trees, until Penny alerted us to their hiding place.)
There is one indoor house in the list of ten amazing residences, the TownHaus.
I once blogged about this house, way back in prehistory.