Tina B
I can personally confirm Dr. Falconer's claim blood work won't show cancer.
I've had two Labradors diagnosed with cancer. The first was, Miko, four years ago when she had sponges removed from her stomach left behind by a previous vet after a spay three years prior...even though she had developed lung cancer, her blood work was "normal" until the very end. The second was last December when our amazing vet found a mass in our boy's stomach when he was there for an annual physical, it ended up a stromal tumor and it was successfully removed...his blood work was spot on, too.
Although our everyday vet is a "traditional" vet...she does not vaccinate "sick" animals with rabies or any other vaccine...a dog with cancer is "sick."
Side note: I've been feeding raw for a few years now, I'm making a few changes to make sure it follows a ketogenic diet...hopefully to prevent any more cancer from attacking our pups.