I have found turkey wire to be a good compromise. It's less expensive and easier to work with than hardware cloth, but much more durable than chicken wire and won't rust in a season or two (depending on where you live and how much rain you get) like chicken wire. I wouldn't recommend chicken wire for outdoors, at least not as the primary enclosure means, and if you live in a wet area it will rust off at the soil level very quickly. And a medium-size dog can tear it. Because it has smaller mesh, t have used it around the base of my pens to keep chicks in, but only in conjunction with something more durable.