Odin's Osteosarcoma

My Great Dane, Odin, who is only 3 years old has been diagnosed with osteosarcoma. This is an aggressive form of bone cancer that affects many dogs. My sweet boy has it in his front, right leg and it has spread to his lungs. To amputate him would just cause him more discomfort and could possibly reduce his quality of life. I am trying to make these last couple months as meaningful as possible and to also make him as comfortable as I can. The amount of love I have for this dog is astronomical and to see him in pain is absolutely shattering me. I want to do whatever I can to make his last days as happy and pain free. Anything given will be going towards his pain meds and vet bills.Thank you,  Berea