We actually use a standard invisible fence for our indoor/outdoor cat (along with our dog) and it works great! He’s been dying to go outdoors since we got him as a kitten seven years ago, but we’d kept him as an indoors-only cat. When he used to escape, he would take off running and we were always scared he would get lost or hit by a car. When we moved to our new house last summer, we DIY’d an underground fence, bought the collar from our local dealer, and he learned the boundaries very quickly. We live on 2 acres so he has lots of room to room and play but doesn’t get himself into trouble. He is so much happier now that he can go outside, and it is so wonderful not to have to worry about him darting out when we open doors anymore. Everyone is amazed when we tell them that we keep our cat contained with an invisible fence – but it really does work!
Full article: http://www.younghouselove.com/2014/04/deckgate/