You can have a kennel of any material you like. Some of the cheap ones are made of wires, nylon, plastic, and even synthetic fiber. If your dog is big, heavy, and a good chewer, you can always go for a large wire kennel. This will not only facilitate your dog's spacious accommodation, but will also ensure that he/she doesn't chew it off. If you're a traveler moving houses often and have a small dog, the best choice for you can be a nylon kennel as this has handles on top and can be easily transported.