Just got back from the vet with Little Cat. She's been dropping weight since Christmas but has otherwise been OK--eating, singing, playing, etc. as always. She got blood work done and has thyroid problems. So, out with ALL the treats--she lives for Temptations treats--and cat food, both wet and dry. She can only have the Rx food (dry and wet). We'll take her back in 8 weeks to see if it's working; if not, we might have to add a pill once or twice a day.
I'm glad it can be managed, and that she's overall in good health/has her normal good quality of life. We lost Fela before Christmas; I'm not ready to lose another pet right now. She is 17, though, but the vet said she should have a number of good years left, esp. since she's an indoor, pampered cat.
I expect to get the stink eye for a day or so, both for taking her out of the house to the vet (only her second time since being spayed as a kit) and for taking away all the yummy food and treats.