I purchased one and collected three other dog crates in preparation for getting a puppy, and ended up not using them. I know some folks find them useful for leaving dogs alone or when traveling (in the car or on planes - three appear to meet airplane standards). 1. For small dogs: Heavy duty plastic "Petco Classic Kennel," http://www.petco.com/product/11074/PETCO-Classic-Kennel.aspx. 26" L X 18.75" W X 16.5" H For pets up to 16" tall and up to 25 lbs. This was used twice before we gave up on crate training our pup, so it's like new. It retails for $40. I'd be happy to take $15 for it. 2. For medium dogs: Heavy duty plastic with wire door, "Petmate Varikennel". http://www.petmate.com/vari-kennel-ultra-fashion-2 Intermediate size 32″ L x 22.5″ W x 24″ H For pets up to 23" tall and up to 50 pounds. In very good condition. I got it for free and will pass it along for free. 3. For medium-large dogs: Heavy duty plastic. There's no label, so I don't know the brand. 33"L x 20" W x 26" H. In good condition, but showing some wear. Free. 4. For medium dogs: Wire cage, some rust. Free. Stephanie