My CA king hasn't eaten for 3 weeks

[Kettennatter]

I never thought I'd have to write this about my adult CA king snake, especially since he had a feeding response that would it make him hard to handle. But he has mellowed out over the last couple of month to where I could handle him with ease. Unfortunately, his appetite has decreased also, to where he hasn't eaten for 3 wks now.

His enclosure is unchanged, with about 88F for a high and 67F at a very low. Humidity about 60 percent, largely because he is prone to making a mess. He either hides in a hide on the warm side or slides under newspaper. The setup is unchanged.

The snake is still very active, responds to me walking up to the enclosure, and does not show any signs of sickness or impaction. While the appetite of my other snakes make decrease oh so slightly with the season, this guy's appetite has fallen off to where it now starts to concern me.

I'm thinking about switching back to live mice to get him started again.