あなた 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 あなた NOT to make your pet rock run away.
Oh, I ロスト my pet Rock Lucas too. Now I only have my カメ named Lucas, my カメ eraser named Lucas, my green bird pen named Lucas, and my stuffed カメ named Lucas.