Enclosures

A-Plus Pet Screen Doors
Allows pets access to the inside and outside of homes.
http://www.apluspetscreendoors.com/

The Cat Terrace
Offers materials, plans and instructional video for building an enclosed terrace that can be installed on a standard screened window.
http://www.catterrace.com/

Cats Curtains
Custom made curtains for cat and dog flaps. Handmade to fit without the need for screws or glue. UK location.
http://www.geocities.com/pattiesangels/cats/

The Cat's Den
Sells custom outdoor enclosures that can be accessorized with awnings, hammocks and shelves. Also offering tunnels and pet door. Located in Canada.
http://www.thecatsden.net/

Dog Door Store
Supplying a range of portal doors, crates, backpacks and travel bowls. Illustrated descriptions and specifications.
http://idealpetproduct.com/

Metalcote
Sells plastic coated wire containment structures. Includes cat baskets, restrainers, rescue traps, and fold flat kennels. UK location.
http://www.metalcote.co.uk/

Patio Door Accessories
Offers a device to allow operation of sliding doors by animals wearing remote collars.
http://webhome.idirect.com/~petdoor/

Patio Pacific, Inc.
Pet doors for walls, doors and windows, screens, and sliding glass doors. Also sells containment systems and automatic feeding systems.
http://www.petdoors.com/

Pet Door Concepts
Offers doors for walls, french doors and glass.
http://www.petdoor.us

Pet Door Design
Offers custom-made exit/entry for patio doors. Installation available by company or supplies detailed instructions for professional installers in purchaser's area.
http://www.petdoordesign.com

Petdoors USA
Allows exit and entry through walls, windows, screens, or patio. Also offers electric doors.
http://www.dogdoors.com/