My 12 year old cavalier was diagnosed many years ago with a heart murmur. 45 days ago he entered full CHF. He is on the typical meds. I thought he was doing well. Coughing all but stopped. But, he was peeing as he walked around the house. He doesn't seem to notice. Today's appointment showed the meds were apparently working and managing the CHF, but wait hold on, what's that....he has developed a tumor in his mouth about the size of the top section of my pinky. It wasn't there at his last appointment. My vet always checks his mouth and ears etc at each follow up. They have taken a biopsy, but expects it will be a Melonoma. My vet said surgery and chemo would normally be next, if it is cancer, but at this stage it would be too much for my little cavalier. The vet said to let them know whenever I am ready to let go. Of course, waiting on the biopsy, but between the CHF and a growing tumor, how long do I wait? He sleeps allot and pees all over, lol. But he is so happy to see us and be with us. I can't leave the room without my shadow, He doesn't play nor does he cry. He stumbles allot when trying to walk too fast, and falls over when he poops as his hind legs have been weak and shaky for a long time, so he loses his balance. He has been deaf for a while and doesn't have very good depth perception. We are all used to it now. The doctor asks how is his quality of life...idk, he sleeps allot, and interacts with us and does not seem to be in pain. I have arthritis and am uncomfortable most of the day, but how do I correlate uncomfortable for a dog? Could use some thoughts...