04-Secret Life of Dogs S01

Our litter of pups are now five weeks old and they're becoming more adventurous.

Testing what they can destroy with their teeth and who they can and can't pick fights with.

But above all, they're discovering what it means to be a dog.

Simple play between two puppies reveals the wild ancestors within.

The hunting instinct, the dominant and submissive behaviours that are essential to pack life.

This is because all dogs can trace their ancestry back to the wolf.

So if all dogs came from one species, then how did they end up to be so many different shapes and sizes?

When we first domesticated dogs, we bred out some of the wild behaviours, and this process accidentally led to new characteristics.

Coloured coats, curly tails and floppy ears.

Add a few thousand years of breeding from the dogs we love the most and you have the huge variety that we see today.