Pulled sets, Canines return...
So why does a dirthole get worked by Fox weeks after you leave the location?
Good Nose? Good Lure or Bait?
I think location has a lot to do with it.
An empty, odorless hole will get a looksee, a sniff, then pee'd on, or dropping left there.
If there is still an odor, I feel some Fox will dig at the hole. Some wouldn't dig.
Amount of digging does have several degrees...by that, some Fox can smell better, some Fox like to dig and work, some Fox will return for 2-3 nights to dig, some Fox will pee and never work set again and so on.
What are your thoughts?