Before a dog knew what was happening, I would slip into its cage ... human factor, again That said, dogs would never have become so diversified without our, well, dogged manipulation of canine mating.

Breeding dogs for particular characteristics, or phenotypes, has been going on for centuries. Dogs are companions and workers, in service to humans, and they have thus been bred to accentuate ...

They then began breeding them with the goal of re-creating the evolution of wolves into dogs, a transformation ... snapping at the front of their cages when any human approaches.