It is claimed that dogs can detect some substances on the order of parts per trillion, and evolutionary hypotheses explaining the ability.Most oncologists will tell you that humans can actually smell cancer in latter stages through the patients breath.
If we can smell it at stage 3-4, then of course a dog would be able to detect the scent much earlier, in stage 0,1.
Canine cancer detection is an approach to cancer screening that relies upon the claimed olfactory ability of dogs to detect, in urine or in breath, very low concentrations of the alkanes and aromatic compounds generated by malignant tumors.
Max smelt cancer in Maureen before any medical scans could pick it up. Dogs do this naturally and can be trained to pick up on tiny volatile chemicals given off by cancerous tumors.
They can even be taught to alert diabetics to low blood sugar levels.While some research in the early 1990s has had promising results, no verified studies by secondary research groups have substantiated the validity of this claim.