Our previous Weimariner used to dig when we first had him. I found on the Internet that putting a small amount of their own poop where they are digging will stop them. It worked like a champ. The digging stopped on the third hole.
2008 Chevy Silverado 2500 Duramax Crewcab
Jeep Commander - sold
Flagstaff V-Lite WRB26