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Why not a custom-made wooden dog kennel for Spot? They're not difficult - just a few tools needs: circular saw, Kreg pocket hole jig, and an electric drill.
The inspiration came from a customer and plans online from Ana White: http://tinyurl.com/j6pzbm2 I make several small changes to suit my customer's need and overall style.
If you want to make it yourself, follow the plans, and adjust to your need.