I'd like to get one but not spend more than I need to and of course I want it to work. I don't imagine they could jump that high but I guess if have to get an idea of the average cat jump height. I'm quite sure one of my two couldn't jump a six foot fence but the other it's possible. I suppose the only way to find out would be to b hold a little test fenced area, which would probably be a good idea no matter what I end up figuring out about this if and when starting to build a fence or have one built. Any ideas/experiences?