I have had great success with hardware cloth laying flat on the ground around the outside of the run. I made sure it came out from the run about 24 inches. I used some very large landscaping pins to make sue it was very flat to the ground. Grass has since grown up through it and it cannot be seen at all. No trenching no digging, so far it has worked very well.
If a predator begins digging it will encounter the wire and not make any progress. In my experience no predator has been smart enough to begin digging outside my hardware cloth apron.
If a predator begins digging it will encounter the wire and not make any progress. In my experience no predator has been smart enough to begin digging outside my hardware cloth apron.