Coyote dens are usually a bit bigger than what you describe - sounds like a fox or skunk took over a woodchuck hole and just reams the burrow out a bit - if you have badger where you are and try trapping one - here is a tip - do not even try to stake down the trao they will just dig it out - use a log about 4 - 5 feet long and tie off to that use it as a drag they wont go far and even if they get back down the hole you'll be able to drag em back out.A drag like that will work on most setups if needed