The Wolf's Footprint — Susan Price

In the darkness, a shadow moved, and something green glinted in a patch of moonlight. Another shadow drifted among the trees. Green eyes and grey shadows, all about them, watching. Abandoned in the forest by parents who can no longer afford to feed them, Daw and Elke are full of fear as night falls and animals surround them. But, instead of attacking, the circling wolves offer them a chance to join the pack -- just one drink from the water pooling in a wolf's footprint will transform them.