My cats have a very secure kitty enclosure. It's fenced to the same height as the house roof with a section angle in at the top(to prevent going over should they ever decide to climb). It's blocked off so the dogs can't even see the cat area. It's about the size of an average city backyard. It's the only place they are allowed outside. A cat in any other part of my yard is dead-- something I learned the hard way.