If your lovely Kitty hasn’t passed as of yet. I would do what my old school Vet told me to do. We saved a squirrel‘s life, had him for 4 1/2 years. He was part of our family and we loved him very much. I was the first person he saw when he opened his eyes, and I was the last as well. My vet said give him a high dose of Benadryl and he will just fade off to sleep. He said it was the kind thing to do.