I haven't seen the documentary yet, but when I have a bit more time I'll watch it.
Since someone already mentioned something about skulls. I have noticed that certain large breeds (GSD, Rott, Collie, Lab) used to have MUCH larger heads 25-30 years ago and seemed to be more stable, family dogs. Now what I'm seeing at work most of the time, the dogs have much smaller, narrower heads and are flighty, nervous, hyper, and unpredictable temperments, not all but a very high percentage. The few that come in that still have the larger wider heads seem to be more like the dogs I remember from the past.
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