With over 400 recognised breeds, dogs can be found in more shapes, sizes and varieties than any other mammal on the planet. During the last few years, scientists have delved deeper than ever before into the canine mind and body and the results are rather interesting. This one-off, heart-warming and revealing documentary narrated by Martin Clunes, explores the truth behind dogs' super powers, their undying loyalty and the incredible intuition of man's best friend. Using intimate macro photography, thermal images and slow motion footage, Secret Life of Dogs examines how dogs see, smell (eww) and experience their world.