I was having this problem with both Sandy and Tia. I totally brought it on myself with Sandy. I was "scolded" by the vet because Sandy is at 14 pounds and should only be ten, and I'm pretty sure this is because I used to feed her wet food for dinner (which I also did with Tia 2x a day per my breeder's instructions...)
So, I bought some Nutro Ultra Weight Control for Sandy and she wouldn't even sniff it dry. Tia was getting more and more finicky with her Royal Canin puppy and of course I started freaking out because neither of them were eating. Then I read this thread early yesterday morning and decided to try the microwave!
Let me tell you! Total and complete difference. I'm adding a little bit of water and microwaving for 10 seconds and they both devour their food whenever I put it down. My husband and I couldn't believe the difference and were thrilled because we had just stocked up on dog food!
So, thanks so much for the advice and for asking this question, it has REALLY helped me out so much!