He had renal failure and was in a sorry old state, so we decided to have him put to sleep. I'm pretty certain he was sticking a middle claw up at me the whole time.
I have mixed feelings about this - none of them good obviously, but am trying to work out if I could have noticed he was ill earlier, done more etc. And I don't think I could have. If he had been one of my own cats, and I had known him better, or he had been in a better state when I took him in then yes, I should have done something sooner. And of course I wish I had taken him to the vet earlier when I realised he wasn't gaining weight. But he was always so unresponsive that noticing he was more lethargic than usual was just...hard. And I was so busy last week that I didn't. And now he is gone.
Sigh.
This was not my finest hour.