Here is a new dog house and a playhouse perfect for your sims backyard. I originally made it for a gift at SMB members so that's why it says SMB in the titles.
EP- Pets need for the dog house
Credit- Echo for letting me clone her rug mesh for the playhouse
http://www.eternal-echo.net/sims/objects/rugs/ Archibase- for the windows are door meshes
http://www.archibase.net/gdlNote: Sadly as you saw the playhouse the walk threw the walls to get in. But Im not a hacker so I don't know how to hack pets ep dog house to make it be a playhouse.