They changed it
Our cats loved it. It used to be their favourite food, but they changed something about it—the shape and smell are different, and it's less "greasy" or something, I'm not even sure. This new version didn't go down well with them; our cat threw up three times because of it and they weren't keen on eating it either. We never had any problems with the previous version. The packaging is the same, but the recipe has changed.