Here's an ever more stark illustration of the byproducts of human intervention via breeding in dogs...jowellz wrote:alphacat wrote:...often selective inbreeding.
That explains these bizarre creatures then.
On the left: the stock model. Nature's original.
The one on the right? Ooops! Did we make that? 
Dog breeding is also one reason that Hitler and his jerksquad thought they could "remodel" the human genome according to their own half-assed ideas.