So took Harley to the vet today and the osteosarcoma/cancer has pretty much come back. It's not looking good. It's also spread to the lungs, but the tumor is the biggest problem because of where it's growing from, size, and the fact it's going a bit into the chest cavity and not just the outside. The vet is going to contact the ncsu vet school and get recommendations on where to go from there. There's probably not much else to do but to slow the progression. I'm not sure what I want to do yet besides the obvious make him as comfortable as I can.