I have this cute little 125 lb. Dane named Tucker (currently with an F) who had become obsessed (6-7 times in 2 months) with digging in one spot of our front entry plant bed. I've talked to him nicely, I've set him up and popped him with the "training" collar, walked him to the scene of the crime and verbally scolded him which is usually very effective..........but there is something with this spot! It's a 3' deep planter filled with pure loam, ideal diggin material.
Here's the mutt and his backhoe length legs.
He left the spot alone for a while, but twice in the last few days he's back at it. This hole will easily accept a basketball with room on top for cream, but the regulation football was convenient.
I've also tried red pepper but he likes spicy food so it had no impact.
Hopefully this is a solution...........I did 1/4 turn the sheet after the picture to minimize snagging a nail.