Help Stinkers a VET.s best friend

Long story short I saved him as a puppy I found him on side of the road. He looked like he was just tossed out of a window. Anyway I nursed him back to good health took him to vet at that time I could afford it. I'm older now and a retired marine who has gained much love and help from my stinkers with being PTSD diagnosed I wouldnt know what to do with out him. But now my best friend is sick I know this not only by how hes acting but a couple years ago I had a few bucks saved and took him to the vet he was diagnosed with a tumor which most likely is cancerous but I dont have the funds for ongoing testing but I see he is sick and in pain. I know him as if he was my son. So in order for me to help him I'm asking for your help please to save my best friend who I would have a harder time living without him. I've been self employed for years but havent had any work in over a year and still awaiting any funding from the V.A! It's been hard I will survive but just worried more about my buddy Stinkers. Please if you can help us it would be greatly appreciated also if any vet receipts are needed I will have no problem administering them to whomever. Thank you again ...Please please help him!