The documentary explores how dogs learn to communicate with each other, and their owners. While barking might seem like the most obvious way dogs can `speak', canines communicate far more frequently with their ears, eyes, tail and snout, in accordance with a strict code of behaviour. Here, future show-dog Ace - a five-week-old corgi - demonstrates an impressive array of yelps, growls, leaps and squeaks, and pointer Molly begins elementary training with her owner, but struggles to grasp whether human gestures and commands are being addressed to her.