How did Little Ann save Old Dan from the Hollow Tree Predicament

This is the only hollow log incident in ch. 10. Old Dan and Little Ann were chasing a coon when they finally treed it. Old Dan climbed up the tree through a hole, but was now stuck. He couldn't jump or he would break his legs. Billy climbs the tree and pushes Old Dan back down the hole. He doesn't want to go down because he wants to get the coon. He tries to climb up the hole again but Billy reaches the ground and grabs his tail just as he is about to go in the hole. The coon finally comes out and Old Dan gets it. Billy and his dogs head for home.