ORIGINAL: Rammer
I'd take 5 gallons of water and pour it down each of the holes. Then take 1 gallon of gas an pour it down onto of the water, then drop a match an get back fast. The doggies will come out fast, if not and you smell hair burning, get about a 20ft piece of barbed wire, and spin it down the hole till you feel resistance then drag up the critter......An old timer told me of that trick!
Why the water, to keep stuff from catching fire? Does this actually work? I've used groundhog bombs (smokebombs) before, but never heard of this.