How can I get my dog to stop digging under fences?

dogedit  |  May 27th 2010

She is 3 years old and is EXTREMELY smart. She goes through chicken wire, metal and wooden fencing, She digs indiscriminantly throughout the yard: fence line, middle, sides, corners, by the a/c unit, etc. I have tried sprays, poop in holes, etc. I don’t know what else to do. Please help!