This system show how we used a small closet for our management system. The dog door leads out to an enclosed dog run. The crate door is left open when the owners are home for the dog to come and go. The crate door is closed when nobody is home so the dog has the freedom to sleep in his crate or go outside but not roam the entire house!
The pink stairs lead to a cat door. On the other side is a platform and branch leading down to the ground. Having the cat use the dog run eliminates the need for a stinky litter box! 🙂