He seems a little off at the moment. He ate about 2.5 FF cans while I was at work, but was hiding when I came home. It took him about 15 minutes before he moved from one hiding spot to the next. Finally I managed to convince him that the bed was a good place to be for his test. He wasn't purring. Not sure if I'd consider it a step backward yet, since he did eat today. I'll keep a close eye on him tonight to see if anything else is off with him.