Head south from Janus' room to the corridor by the kitchen to find the cat.
If you saved before entering the castle, you may want to re-load and put off going to there for a while. The dungeon you have to escape from after this would be a little tough at level 7, though you should be able to make a run for the exit (a statuette or shadow potions would help with this). Also, you will be without your teleporter stones until after you rescue Zandalor.
