The Dog Play Pen by PETMAKER takes only seconds to set up and is great for indoor or outdoor use, providing a secure and comfortable area for your dog, cat, hamster, ferret, or other small pets. The cat playpen for indoor cats has mesh windows for air circulation, a removable roof for sun and shade options, and 2 doors with hook and loop fastener tabs to hold the door open if you choose. The hamster playpen comes with 2 pockets for storage, a holder for an exterior water bottle, and 4 easy-to-use metal stakes to secure the cat pen during outdoor use.