They say that for certain breeds, certain ages can be milestones for some breeds. Such as age 7 for Akita's. age 4 -7 for Aussie cattle dogs.
That if they don't get something by that time, you are ok, the same for age 7 for some breeds of dogs, ( I think discounting giant breeds, that if those dogs live pas age 9 you are doing great!!)
I am so sorry you are going through this. I would if I were you see how well your dog's breed has faired with chemo or radiation treatment IF that is an option for you.
We found out through much heartache that after our 4 yr old ACD came down with lymphoma cancer that her breed was one of the ones that "falls through the cracks", we lived in California at the time and spent, around
3000 in chemo treatments only later to find out it did nothing for her. Round trip visits to UC Davis, for 2 to 3 months...
So when we found out our 11-12 yr old ACD had lumps on her liver and pancreas, we opted to have her put down, as she had been throwing up blood, and she suffered for a week, while another vet kept suggesting
she take something to calm her stomach... The vet that found the lumps was SHOCKED when we opted for having her put down. We knew though, we knew and he hadn't been as familiar with the breed as we were.
Why put a dog through that if you know it won't do any good.
BUT if it can help save your dog, and if you have the insurance or the money, go for it!!!
But hugs either way!!