Holistic treatments can be wonderful - vincristine, the most common chemotherapy agent used in humans and pets was a holistic treatment in a different form.
We saw a 2 year old Golden Retriever yesterday for a CT scan. Has osteosarcoma on a rib. He is fed raw food since the owners acquired him as a puppy. He is going to be put to sleep next week because the osteosarcoma has grown so large its invading his lunges and pressing on his heart (and has mets). The timeframe from the time it was first noticed to the CT revealing the mets was 2 weeks. Very sad.
Apparently with talking with the oncologist, osteosarcomas in older dogs is usually very slow growing. She has seen so many older dogs (10+) that can go without treatment and do just fine for years. Its in the younger dogs that its extremely fast growing and usually also involves soft tissues.
Fish - is your dog older? If so, this may (in a strange way) be a added bonus for him!!! She has known several older dogs where the osteosarcomas have outlived them!!