Big, Beautiful, Fluffy Gray Cat

One sunny spring morning while looking out my window, what do I see? A big, beautiful, fluffy gray cat! The cat was rubbing on my catnip plant and loving it! The second I stepped out the door to greet the cat, he ran off like a shot. Where did he go? Does he have a home? Months later to my surprise, the big, beautiful, fluffy gray cat was back. Oh no, what happened? Now he is very skinny...