Make a hot pepper tea as if you were making sun tea:
put water in a gallon jug, shred/chop/puree & add the hottest peppers you can find (cayenne is good), & set the jug in the sun. If it's too late in the year for sun tea, boil some water & toss in the peppers; turn off the heat & allow to cool. Spritz over the areas where the dog is digging. You'll have to refresh the pepper as it wears off, & you'll need to refrigerate any leftover "tea". Do not use ammonia;
although it repells them from digging, it smells like tee-tee & they'll "mark" right on it! Best luck! | 
