An in-depth look at dogs' ability to detect cancer in humans. Includes the results of scientific trials testing sniffing abilities. New.

Can Dogs Smell Cancer? 9.00pm BBC4
Not as daft a question as it might sound. The astonishing answer seems to be yes: some dogs can sniff out some cancers quite reliably. It may be a while before patients abandon the science lab for the labrador, but the evidence here - and not just anecdotes, but rigorous experiments - suggests it's a technique worth developing. A film no dog-lover will want to miss. DB