Matt reined Sabrina in, slowing her to a stop so he could cock his head, listening for any sort of sound that might be out of the ordinary. He thought he heard a bark a little ways off, and he turned Sabrina off the trail into the woods. Penny called for Lucky once more and he heard a definite bark in response, just over the hill.
Matt nudged Sabrina onward and then stopped, quickly dismounting- he left Sabrina as she was, knowing she wouldn't go anywhere, and he offered Penny a hand to help her down before turning in the direction of the barking. He approached it, surprised to find a hole in the ground- it looked like Lucky had fallen in and couldn't quite get out.