Update, around 4:30 on Thursday:
I couldn't bring myself to write much of anything earlier today.
The first picture is Mr. Boo on the sunny warm Sunday before we had to put him down.
The second and fourth are on the morning we had to do it (11/12). He always got to lick my yogurt bowl. Oddly enough, on this occasion, he was calm and looking at me while I took a few pictures after he finished.
The third is him from some weeks ago on his dog bed under the heat lamp.
Thanks everyone for all the comments ...