Personally, I would be operating and depending on whether it is systemic or not - I would also be doing chemo (systemic) or radiation (if not)... My boy Ollie was in the same position and we excised lots of tumours, then did chemo and treated him holistically as well- he is still here, six months more than was predicted and is looking so well, even the oncologist cannot believe it... He was 8 when he was operated on the first time.
If you are still against surgery, please consider holistic therapy. Lucinda (dogbesotted's girl) has lived with terminal MCT for over 5 years now and she has only been treated holisitcally.
Best of luck..
Back to Hero - how is he going, any news???
Where we live (in rural country) the region does not have the facilities for chemo or radiation or evven holistic therapy for animals, that is the downside and why I think I have to chose the option I have for Gemma. I would be all in for surgery and chemo etc etc and I do not have the means to move to be closer to such facilities. It is sad but I can only provide for my baby girl with what is available to us right now. :D