This is a thought provoking question; no doubt about it.
Not too long ago during one of my sleepless nights I came across this series of articles that relates to many of the questions that have come up here.
The author was trying to develop a strain of naturally short tailed boxers and he crossed them with Cardigan Welsh Corgis to do it.
Though I certainly don't agree with what he's doing, I found the reasoning and the results fascinating. The insights into what it actually takes to develop one breed by mixing just two breeds is mind boggling. Just think what it would have taken to develop many of the breeds that are in existence today.
Here's the link! You don't have to be a student of canine genetics to understand it.
Genetics and Cross breeding
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