Went Saturday on our club we killed 3 and on the last race almost back at camp dogs ran hot then stopped we all said rabbit must have went in a hole. Got back to camp and had a missing dog, us and owner went looking walking down one of our woods roads stopping and calling and at one of the stops he heard a faint whine. The dog had dug up into a huge standing hollowed out poplar tree whose roots were exposed on a creek bank and was stuck, took 2 hours of cutting to get him out.