Why do we think we are so superior  to other animals such as dogs . A dog trainer can pick out the smartest and most physically capable puppies in a matter of days ,then selectively breed them to enhance the breed ! Humans have been doing this for so long that the breeds are quite different from the original wolf ! So some of the human breeds have also changed thru culture impacts in their selective breeding while government interferes by subsidizing the breeding  of the dumbest and discouraging breeding of the most capable as they spend more time doing the work of society and having fewer or no children later in life !