Well, I called the vet after my husband went home for lunch and reported how pitiful Binky was. He left me a message saying it was okay to mix his favorite food with the i/d. So I warmed up the offending food and added his favorite (only a small bit so he won't throw it up).

Poor guy was hungry!

I'll try the broth trick, too, just to add a little interest.

Thank all of you for your good thoughts and suggestions!