One of our cats has cancer, he has done really well but I feel is near the end. He is hardly eating and is just skin and bone, he sleeps most of the time and doesn't really go out much. He has such a close bond with DH but I can't convince him the kindest thing is to let him go, he keeps making excuses like the reason he's not eating is because the weather is so hot and he has always been skinny. How can I convince him it's time to say goodbye.