We have a 6ft wooden fence along the back of our property and a 4ft chain link to finish it off. Only our backyard is fenced. It's a 90 ft by 60 ft enclosure. We put up the wood one ourselves for under $400. but that was 10 years ago and the chain link part cost us $1500. to have put up four years ago. I agree with some of the others about the underground fencing,we did think about it, but I would never feel it was safe and other dogs could go right over it.