How to make a house for a cat out of cardboard - YouTube
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FurHaven Pet Cat Scratcher | Corrugated House Scratcher with Catnip, Condo Hideaway - Walmart.com
Amazon.com : Navaris Modular Cardboard Cat House - DIY Corrugated Cardboard Configurable Play Tower Condo for Small Cats, Kittens, Rabbits - 4 Cubes with 2 Bridges : Pet Supplies