The advantages dogs gave early man were huge – the animals themselves were likely to be larger than our modern day pooches, at least the size of German Shepherds.

Because of this, they could be used as ‘beasts of burden’, carrying animal carcasses and supplies from place to place, leaving humans to reserve their energies for the hunt.

In return, the animals gained warmth, food and companionship, or, as Shipman puts it, ‘a virtuous circle of cooperation’.