what do you think happens to Zaroff ?

Zaroff is killed.

"After drinking a nightcap, he (Zaroff) heads towards his bedroom. Immediately after switching on the light a man appears from behind the bed’s curtains. It is Rainsford. Zaroff congratulates Rainsford on his win. Rainsford tells Zaroff that the game is not over yet. Zaroff agrees—whoever wins the last battle would sleep in his bed, the loser be fed to the dogs. The story ends with Rainsford remarking on the quality of the bed he slept in that night."

he was fed by the hounds .