We're faced with a tough decision. It's about Maxwell, the dog featured in https://www.physicsforums.com/showpost.php?p=1632392&postcount=30". He has bladder cancer and we took him to the vet today for a check up. He recently started dripping urine and blood. The ultrasound shows that the tumor fills nearly his whole bladder. Just a few months ago, it was tiny, maybe 1/10th that size. The vet suggested we try an anti inflammatory, which might reduce the tumor a bit. I don't put much faith in that but it's worth a try. He doesn't seem to be in any discomfort, though. So now what? Well it seems that we will have to euthanize him. For PFers who have had to do this, how did you deal with it? Specifically, what criteria did you use for deciding when? It feels wrong to make this decision based on what's convenient for me.