She is pretty much only licking the gravy of her wet food and not eating much of her dry food. Our routine in the past: we would give her wet food in the morning and dry food in the evening. She would usually eat all of it pretty much right away. Three days ago we noticed she did not eat all of her dry food by the time we gave her the morning feeding. Then she mostly just licked the wet food. As the day went on, she did finish her wet food. That evening we gave her dry food as usual and she started eating it with gusto, but just for a short while and definitely did not finish it. Yesterday, she again first just licked her wet food, then as the day progressed ate the rest of the food. She still had dry food there, so as an experiment, I added water to her dry food, and as the day went on she ate much (but not all) of that, too. This morning the same thing - just licks the gravy off the wet food. She is a 12-year-old Domestic Shorthair, with many similarities to a Russian Blue. She is also very very difficult to get into a carrier to see the vet, and she has attacked the vet quite a bit, so we are reluctant to bring her in. Also, I forgot to mention - we only very occasionally give her dental pet treats, but we gave her some several days in a row (we put them in the advent calendar as a holiday treat). We have a new package of treats and an old package of treats. For several days I had given her the treats from the new package, but the last time we gave it to her, it was from the old package, which had a "best by" date of next week.