Puppies, in contrast, begin to explore and walk after all three senses-smell, hearing and sight-are functioning. Instead of fearing stimuli, they seem to love it and even seek out new adventures, as anyone with a puppy happily nipping at their toes has found out.
"It's quite startling how different dogs and wolves are from each other at that early age, given how close they are genetically," Lord said. "A litter of dog puppies at two weeks are just basically little puddles, unable to get up or walk around. But wolf pups are exploring actively, walking strongly with good coordination and starting to be able to climb up little steps and hills."
It then sounds like there is a tradeoff between world readiness and fear and aversion. Dogs, due to their association with humans, usually get an easier, more protected start. Puppies have time to grow and develop in guarded care. Wolves, on the other hand, have to nearly hit the ground running, able to escape predators and avoid other threats.
Lord and her team came to their conclusions after studying the responses of 7 wolf pups and 43 dogs to both family and new smells, sounds and visual stimuli.