I put up a six foot chain and post on three sides and wood privacy fencing on the front for our two dogs. The chain and post is at HD or Lowe's in big rolls with the posts usually painted green. You drive the posts in with a heavy red two handed post driver.
I do not recommend the prefab fence because if there is a slope of just 3 or 4 inches to every 8 feet of run your dogs will tunnel his/her way to freedom.
If you need/want to put in a privacy fence, do it with the individual 1"x6"x6' pressure treated lumber not the prefab panels. I takes much longer to build but will give you a lot more piece of mind. Plus they look better to boot because they follow the contour of the land rather "step" every 8 feet.
However, if your land is flat, price the prefab and go with that if it fits your budget.