Update on the situation with the little bugger that is our dog. Indeed, is. Because, get this, while he was in a torpor on Sunday when I posted, refusing to eat and being lethargic and all, on Monday he was unable to even get up and move, so we put a water bowl right next to him. He'd wake up every now and then, drink a little, and would fall back asleep. We already called the vet, because it was clear that he was suffering, and we all expected him to die, so why not put him out of his misery?
Yesterday morning he just got up from the mattress we put him on and walked to his water bowl, drank, then walked around, growled at us as usual because he wanted to be put back on the mattress. He ate a bunch of treats like nothing happened, although he still doesn't wolf down his regular food like he used to. When my wife's sister came to visit he went and greeted her. Not as energetically as he used to, but still, he basically moved more than in the past few days combined.
He's also sleeping soundly, with his usual relaxed expression, instead of sleeping fitfully.
We put a wet towel on him to help him cool down as it's been ghastly hot these past few weeks, almost never cooling down for more than a couple of hours, with annoyingly hot nights.
So, yeah, no idea what is going on, but it doesn't look like the acute organ failure through metastasis that we expected it to be, because if so he would not have improved and probably died by now. We honestly thought the tumors had progressed to the point of organ failure.
We're still going to lose him soon - I mean the tumor is not going anywhere, obviously, but perhaps not right now. Or even if he ends up dying really soon, at least he seems to be content instead of suffering. Which is more than we thought he would get.