anda should learn how to care for your pet rock! I'm an expert pet rock trainer, and mine (his name's George) is now a fully grown, highly accomplished boulder!
Here's a book that might help anda NOT to make your pet rock run away.
Oh, I Lost my pet Rock Lucas too. Now I only have my penyu named Lucas, my penyu eraser named Lucas, my green bird pen named Lucas, and my stuffed penyu named Lucas.