He hasn't been himself, but we've been so busy with the kitchen that I wasn't paying him enough attention. Last night it was obvious that he was ill, so off we went to the vet today.
He is dehydrated and anemic, so is staying overnight for IV fluid and tomorrow will have a blood transfusion.
The rest of his labs are off as well, white count, granulocytes and platelets are through the roof. If I were looking at these labs in a human, I'd diagnose it as leukemia. The vet tends to agree with me, but is sending the slides off to the state lab for final diagnosis. I should hear something tomorrow.