NEED HELP - Digging Dog - What's Best Way To Stop?

OK, here's the latest. This morning while I was out on a job interview, my wife watered the flower bed where all of the digging has been and then sprinkled cayenne pepper on the ground (I swear, she used so much the ground was 'red' - I told her we're going to have pepper bushes all over now). Both of us were gone for a couple of hours this afternoon and both dogs were outside the entire time we were gone - no digging!
Woo hoo!!! Let's hope this works.
The big test will be this coming weekend since we're going to be gone most all day both Saturday and Sunday (Spring Fling weekend), only returning home Saturday night.