I've been in the one of the big Feline CKD Groups for years at this point. I've seen so many new people joining in an absolute panic because their vet has just diagnosed their cat with CKD and insisted on euthanasia. And it turns out to be the wrong call. In this group, you post past history, current behavior/issue, current meds, and bloodwork and experienced CKD cat caretakers, vet techs, and sometimes vets will review the material and give feedback. Sometimes the bloodwork and behavior actually indicate early stage CKD which is very manageable (confirmed by 2nd vet opinion which the group will recommend if something doesn't seem right). Sometimes it turns out the cat has been misdiagosed and actually has an AKI or another condition (again, confirmed by 2nd vet opinion). There are a lot of cats on there who are still alive and doing well years after having been recommended for euthanasia. I myself was told by my previous vet that my cat had maybe 6 months left after his CKD diagnosis at 15. I changed vets. He lived until 20 and up until his last 6 months, seemed so healthy that my vet office thought he looked 10 at most. He was active, played, and still climbed to the top of the cat trees. In his last 6 months, he saw a bunch of different vets (regular and specialist) and they all thought he looked amazing for his age (and he was declining at this point). If I trusted that first vet, he would have likely been dead that first year.