I wonder... Dogs are all the same speices, Canis lupus, yet some breeds are known to be highly trainable while others are not.<p>What <i>else</i> could this be other than genetics?<p>Dogs are mammals, aside from their proportions their bodies are nearly identical to ours.<p>Therefore, ought it not be possible to selectively breed for humans for traits such as trainability, calmness, and emotional stability? These are all traits some dogs have been selected for.