Shock collars work, when used correctly. We had our dogs "snake proofed" by the local GSP assoc. Man, if anything hisses at all, those dogs jump up & start barking up a storm & look around for the culprit. Thye are not only snake proofed, but awesome snake detectors, too.
Another way to keep them from digging in an area is to fill in the hole & place a nice, fresh example of their poop right on top.
Border Collies are pretty high-energy poches, like our German Shorthaired Pointers. The best thing we did to eliminate behavior problems in our first GSP...was to buy another GSP of the opposite sex. They have become best buds & play all day long. Instead of my stuff, they chew on each other, for instance.