The Pill Pockets were a godsend during the last months of our Scottie mix dog's life. I'm not sure how they'd work for a cat, but they would certainly be worth a try. You'll know when his quality of life is compromised. We had a dog when I was growing up who had a heart murmur and lived to be almost 16. We played with him all the time. He loved his squeekie ball. Do what is right for you and your family. With Arthur (the Scottie), DH and I sat down by ourselves and decided what steps we would and would not take.
Hugs!
Deb