My husband and I made that decision a while back concerning our Sam-cat. After a bunch of years with us, our new stray was making her life miserable, to the point that we had to put Sam on nerve medicine. Our others, who she had grown up with, chased her around a bit but it got worse.Fortunately a very good friend had just bought a house and she and Samantha bonded immediately. Sam is now the Queen of her new home and loving every minute of it. It was a tough decision to make but just hearing how happy she is makes me smile. Best wishes to Oliver in his new home. And **hugs** to you for going thru such a tough time....