Thanks for your response, Winston. I have been trying to entice Blue with all manner of appetizing foods since this started, Thursday morning. (I spent this afternoon making beef broth for him because he still drinks water.) He won't touch solids and so far he won't touch the beef broth either.
He is lethargic and weak and he is walking gingerly; his back is a bit hunched up and I know his tummy is tender because of how he responds when I touch it.
His bum doesn't look sore but we did just notice some nasty looking discharge from his penis, so I'm starting to think some kind of prostatitis. (But his bloodwork was clear and his temperature is normal...?)
I do give them pumpkin from time to time but he won't eat anything right now. Again, thanks for your interest. I appreciate the input.