This one I've seen before and heard real good things about. It's good if you already have a fence or wall. I think you can also put it around tree trunks to keep the cats from climbing them and then jumping over the wall. It's also less expensive: http://www.catfencein.com/
Here's a catyard someone built. I don't see plans but if you scroll down you can see how they did it. Looks like posts and chicken wire with a roof. You could just install a pet door so Barry could get in and out of the house: http://www.kimayarozes.com/catyard.html
no subject
This is one I haven't seen before but looks very good if you have an open American type yard: http://www.purrfectfence.com/outdoor_cat_enclosures.asp
This one I've seen before and heard real good things about. It's good if you already have a fence or wall. I think you can also put it around tree trunks to keep the cats from climbing them and then jumping over the wall. It's also less expensive:
http://www.catfencein.com/
Here's a catyard someone built. I don't see plans but if you scroll down you can see how they did it. Looks like posts and chicken wire with a roof. You could just install a pet door so Barry could get in and out of the house: http://www.kimayarozes.com/catyard.html