I am sorry this is happening to your dog. Dogs become family members and I can understand your distress. I dont particularly care for how doctors scare people into chemotherapy but I digress.
There are a few alternative beliefs on what causes cancers that are interesting. Some believe it is connected to a fungus. Some cancers are medically attributed to certain aflatoxin exposure. Others have stated the cause of most disease is lactic acidosis.
I think that both hypothesis deserve more research but the status quo on cancer makes so much money now that I doubt we would ever get the truth from the medical community.
Over 100 years of research with millions every year donated and the best we can do is chemotherapy?
Since you have decided against chemo, it doesnt mean you cant try to approach this from different angles or other alternative approaches exactly like you are doing.
I am not versed on Rife machines but maybe others who are will join in the discussion.
There are people who are successfully treating their pets with carbon C60 for all kinds of lumps and ailments with encouraging results.
If I were personally diagnosed with cancer again in most cases I would likely resort to anitifungal drugs, adjust to a more alkaline diet or at minimum change what I am consuming, as well as take things that address aflatoxins which I do now in hopes to prevent it from happening again.
I would also visit cancertutor.com a lot more as they are versed on alternatives.
Just thinking aloud here in hopes it might give you some ideas to try. I hope you continue with the Rife or other alternative treatment, see amazing results, and report them back to us.
2014 Mold Sick,2015 Clinical Lyme and co.,2016 Morgellons,2017 Remission
" The path to disappointment is paved with expectations "