Earlier theories related to the Damorian variability hypothesis were along the lines of head size and phrenology. All shared the common feature of working backwards from the desired conclusion.
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That's folklore. Working dogs are traditionally chosen for very simple reasons, including tradition, size and strength.
Working dogs have been selectively bred to do both physically and cognitively challenging work for hundreds of years. Within- and between-group differences in trainability and ability to work under conditions of uncertainty are very well established.
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You can keep repeating it, but it doesn't make it true.
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Okay, but what evidence do you have for believing otherwise? A tremendous number of professionals would have to be completely mistaken, and intelligence, cognitive speed, and any temperamental traits that mediate the expression of cognition would have to be 0% heritable.
End of conversation
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