As MOA is conveying....In short, stay away from 'designer dogs'. I really hope the crosses are healthy.
The theory is a statistical outcome. You would be more likely to have interbred problems by staying within a breed, than by crossing out of it. That assumes of course that you are making an informed cross about optimising outcomes with the selection of the introduced variety.
The above statement is just wrong by implication if informed choice is sound. A broader gene pool is more desirable in general that a narrower one is.
That of course doesn't mean that people aren't stupid, greedy, or incompetent about such things...
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