This is very interesting to me. I was thinking why did it differ only around the eye? I started to think about my own dog that is a black labrador. I was thinking about how I love the size of him and how when I hug him, I think about how I am hugging a big bear. I think us as humans haven't selected only dogs that are a certain breed (although there are certain breeds that are more common.) We like all different types of dogs for different reasons. I think that they haven't changed much physically due to the fact that we like the idea of owning a dog that seems like a wolf. But other breeds have changed a lot physically- like we talked about chihuahuas. Some people favor them being very small so those have also been selected over time.