My cat went through a phase when he wouldn't eat. He was on a complete dry food (Royal Canin) at the time and the Rep. told me that unlike dogs, cats are stimulated to eat by smell. He advised me to pour some hot water onto the dry food (then cool it) so that the smell intensified. It worked

. I don't do this all the time, only when he is being picky. I must say that unlike the dogs, I do vary the cats diet. They seem to appreciate variety.
Leigh