Mittens was such a gorgeous Fluff-tail. Maine Coons, including mixes, are a unique breed, the Border Collies of the cat world. I miss our MC, JC, terribly - he was the quintessential family cat and a real country-boy. I have plenty of rescues but JC was one-of-kind, just as I am sure that Mittens was. As for tumors, sometimes they just show up randomly and grow fast. You chose to spare Mittens what would have been a lingering misery. You blessed him with a wonderful, full life and you gave him a final gift - a humane, dignified passing. Godspeed and tailwind west, Mittens.