If we are talking about the same picture she put chicken wire on the top to protect the cats from hawks. The height of a fence will not keep a cat from going over the top of it Some people in San Francisco had a big old (fixed) tom cat that would do anything to get outside. They purchased a home and got the zoning dept to give them permit to put up a 12' chainlink fence. the yard was big so it cost them big bucks. The big day arrived. They opened their back door and told the cat go for it. Well the cat ran to the fence, climber it, stop at the top and gave them a toss of its head and down the other side it went. It did come back. That was an expensive lesson. I live on the edge of a park with a 12' chainlink fence with barbed wire on the top that my neighbors cats go up and over all the time. To keep cats from going over a fence you need to put something on the top that slants inward & upward. To go over the cat would have to climb upside down and I don't think any cat is going to do that. Look at the picture of the ad for Fence-In in the back of a Cat Fancy magazine. I will post the picture I am talking about. I saved it.
