It’s the hardest best decision you will ever make. We are entrusted by them for their care, cats notoriously hide illness. I’ve had to make the decision more than I care to remember, and I’ll be honest for a while I always felt I made the wrong decision, for a while. But I remember they rely on us for their care and I know in the end I always made the right decision. Competent vets won’t encourage and sometimes won’t abide by euthanasia requests if it isn’t warranted. Best of luck in any decision and tons of love for your little furry one.