I am sorry for your loss. If it has gotten that bad it's probably better he not be put through any more pain like you mentioned.
My girlfriend and I owned a rat terrier and had the same exact thing.
Dog was fine and suddenly started becoming lethargic, gaining weight.
Took her to the vet and they could not find anything.
Spent a few months and a few k on tests and meds to raise her white platelet count.
It fluctuated a lot during that time.
After a few months they found a huge tumor in her chest and they could not do recommend much more than enjoying what good time we had left with her.
One day she was in the back going to the bathroom and she fell over in her own shit.
There were some bad signs before that but we didn't realize how bad it actually was for her until then.
Had to put her to sleep, was horrible and it was the gfs first dog 10+ yrs with it so se was nuts.
She can never be replaced but the hole left by her absence was too much for the gf.
Took two 85 lb dogs and 2 cats before she started to heal.
If your dog is suffering, you are probably doing whats best.
For what it is worth, the process is painless other than the pinch of the shot and quick.
Best of luck
Edit:
I linked this video a while back for another gfyer who had a similar situation.
It is a sad story but helpful if you have never been through the process.
You can see how its like when you have to put a dog to sleep.
I saw it before I had to put mine and though it was painful, the video was comforting in a sense, to see how quickly and painlessly the process is.
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