@Frank

Basically, I can say the majority of people who breed and KEEP the litters look for the same things, but we tend to misinterpret what we want with what we think.
One can not be a "little pregnant" so we will see a lot of things in a pups actions BUT make excuses to OURSELVES.
Now I can tell you with certainty that some pups have been real hermits, never barked at a dog and actually played with curs but once placed in the squared circle become a complete beast.
I've seen and owned one that actually would watch with his head on the wall of the box 2 going at it, but not jump in.
When told/asked if he wants to go...as if you are taking him out for a walk he would start to scream and cry .... The best part is he would (at times) jump over the wall in the middle of the box and turn and look at the closet corner, run to the corner and turn without stopping and scratch right back at a dog.... It's as if he knew he must start from the corner and always have to scratch from a corner.
This was not your regular dog but then again, none of these dogs are regular.
Seen one go just over 3 hrs to a draw, stop 17 mins in his next.
Live Love and Learning..... these dogs.

North Strong.