We had a beloved golden retriever that was diagnosed with breast cancer. We had a mastectomy done on the affected side but unfortunately it did not get all of it as it had already begun to spread. Our vet gave her a couple months to live.
My wife, in desperation, found out about a study using acai berries to treat cancer in k9 patients and had some success. If I remember correctly it was done somewhere inear Florida.
We used that as well as graviola. She ended up living another 12 months and ended up passing due to congestive heart failure. Our vet was so impressed he asked for info on our treatment.
I do not want to give false hope and I am not claiming this cured her completely but it gave us more time with her and I hope it helps do the same for you. We loved our golden, she was awesome.