It is astounding, isn't it? Of all the good-quality foods I've tried, Dave's has by far outlasted the others - which is not to say that Celia will decide tomorrow that she no longer likes it. Actually, she's been licking at her food since yesterday. And, no joke, 3 cases arrived today from chewy.
Maybe you could at least make back some of the money you spent on the food by putting the unused cans on craigslist? That's what I'm thinking of doing with all the stuff that Celia won't eat, use, play with, etc.
And have you tried being mean? Or is he in the mold of Cuddles and Celia?