love this attachment from the house to the cat pen.
How to build a cat cage http://tazthecat.net/catcage/one-html/catcage-howto.html
Outdoor Cat Cages | Build A Cat Cage by Mireya
Catio - how great is this?
Great idea for a temporary cat cage we could construct for our 4 kitties once we get moved. This would be much better than living in cages while we create a kitty-proof room for them in our new home.
The cat's meow: Check out cat patio styles on the Catio Tour (photos, video) | OregonLive.com
4ft SunCATcher Cat Cage, Cat Condo, Outdoor Cat Enclosure. I love this product. So many variations.
Double Decker cat cage with middle floor from Penthouse Products
How to Spruce up Your Cat's Bathroom / My Saskatoon