Question: do dogs sense cancer? how

Sandra Robertson answered on 12 May 2025:

Dogs have a highly sensitive sense of smell, able to detect many things we simply can’t with our own sense of smell. Think about dog companions used to alert owners to an on coming seizure – it is the change in the person’s internal chemistry that the dog is able to detect to raise the alarm, that allows the owner to get themselves to a safe space. If a dog can be trained to do that, then I believe they can be trained to detect some forms of cancer in the same way, when there is a subtle change in a persons chemistry (smell)