This is actually what I do and yes, it does work. Fill the hole with your dogs poop. Trust me, dogs don't like to dig in their own crap. Occassionally, my dogs will dig a hole next to the crap filled one, I fill most of the hole with dirt-the top portion with poop, and then a thin layer of dirt on top. Problem solved, they don't re-dig the hole. It's the only thing I have found that actually stops them; oh, and its not harsh on the dog.