A common misconception about underground fencing is that it needs to be buried "Underground". There is no need to spend a weekend burying the wire underground. Using wire pegs you can staple the wire to the ground. Within a few weeks the root system of your lawn will grow over the wire and hide it completely from view, essentially burying it into the lawn. Make sure the wire is completely flush to the ground. It is recommended that sod staples are placed every 5 feet.

500' feet (1/3 acre) you will need 100 staples
1000' feet (1 acres) you will need 200 staples
1500' feet (3 acres) you will need 300 staples
2000' feet (5 acres) you will need 400 staples
2500' feet (10 acres) you will need 500 staples
3000' feet (13 acres) you will need 600 staples
3500' feet (15 acres) you will need 700 staples
4000' feet (20 acres) you will need 800 staples
4500' feet (30 acres) you will need 900 staples
5000' feet (35 acres) you will need 1000 staples
5500' feet (40 acres) you will need 1100 staples
6000' feet (50 acres) you will need 1200 staples
6500' feet (60 acres) you will need 1300 staples
7000' feet (70 acres) you will need 1400 staples
7500' feet (80 acres) you will need 1500 staples
8000' feet (90 acres) you will need 1600 staples
8500' feet (100 acres) you will need 1700 staples