I bet there's something you can do to make Demon feel better and extend his life. You might even end up curing him. I've been helping some friends who have a yellow lab with cancer- and she's still alive and happy- for a year now- with holistic medicine. For instance, just now- I googled "Dog enlarged heart" and am reading this article that states Taurine (dirt cheap amino acid) plus Carnitine and CoQ10 are helpful. Here, check this out: http://www.dog-health-guide.org/dogenlargedheart.html BTW- I used to buy all the amino acid supplements and stuff like MSM, glucosamine, chondroitan, & Carnitine for my son and I from this company in Maine that sells in bulk, dirt cheap. Check out "Beyond a Century" online catalog- flat fee shipping $5. Good Luck.