Such a special dog: it can create petrified clones of itself. That's useful, because it's stuck in an underground system of corridors, from which it tries to escape. It can use the petrified clones as stepping stones, when one single jump isn't enough to get on top of an obstacle. You can also create such stepping stones when the little dog's in mid-air: this allows him to jump over spike traps. These are highly dangerous! The less stone blocks you use, the more stars and points you earn.
Press the left and right arrow keys to walk and the up arrow to jump. If you want to make a stone 'copy' of the dog, press the spacebar. You can do this a limited number of times per level. By pressing X you remove the last stone block that you created. Press R if you want to replay the level.