I’m sorry I can’t help but to offer prayers. Trust me, I feel your pain.
Same for us. We had a large tumor removed from our old Black Lab 3-4 years ago and the vet wanted to know if we would like to send it off to determine if it was malignant. We declined and our lab lived for another 2 years or so until it came back and we had to put him down at the age of 13.