My bridge girl Gypsy was very fussy her last year. At one point she would only eat if she got warm chicken alfredo over her kibble. At other times it was freshly grated parmesan cheese (forget the canned, it wasn't good enough). Then it was beef gravy and it better have chunks of beef. Then canned tuna. She cycled between these, sometimes all she would eat was ice cream. She did like vanilla Ensure, I got the high calorie one for her. We could usually get her to drink that if nothing else was appealing to her.
We catered to her and called her our Little Diva.