Whatever happened to Fluffy?
Well, I don't know, but here are a few theories:
One of them is that he got shipped back to Greece. Y'know, bit dangerous to have this…thing hanging around Hogwarts. I mean, come on, it's a three headed dog! Not exactly easy to feed. What if one of the students magically disappeared?
Or, he may have been turned into adobe and fed a lot of people who unwittingly ate a three headed dog. (School lunch, maybe?) he could have fed thouseands and saved the world's starvation problems, but….here's what really happened.
They kept me in the school for a while, all alone and desolate, with a mere ten kilos of raw meat per day. It wasn't a fun life, trust me. But one day, I got shipped off to somewhere. The box was full of straw and smelled like some horse had decided he couldn't wait, and….yeah.